A person wears spectators with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes – (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot

A person wears spectators with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes – (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot
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(2) in front of the retina Explanation: A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
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A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focussed in his eyes (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot

Description : A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focussed in his eyes (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot

Last Answer : in front of the retina

The junction of optic nerve and retina is insensitive to light and no image is formed here , it is known as ______. a)blind spot b)yellow spot c) fovea d)pupil

Description : The junction of optic nerve and retina is insensitive to light and no image is formed here , it is known as ______. a)blind spot b)yellow spot c) fovea d)pupil

Last Answer : a)blind spot

15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and nature of the image. -Physics-10

Description : 15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and nature of the image. -Physics-10

Last Answer : Object distance (u) = – 27 cm Object height (h) = 7 cm Focal length (f) = – 18 cm According to the mirror formula, The negative value of image height indicates that the image formed is inverted.

A colour-blind person cannot – (1) See distant objects (2) See black colour (3) Distinguish between certain colours (4) Have persistence of vision

Description : A colour-blind person cannot – (1) See distant objects (2) See black colour (3) Distinguish between certain colours (4) Have persistence of vision

Last Answer : (3) Distinguish between certain colours Explanation: Colour blindness or colour vision deficiency is the inability or decreased ability to see coluor, or perceive colour differences, under normal lighting ... to the optic nerve. This type of colour blindness is usually a sex-linked condition.

A colour-blind person cannot (1) see distant objects (2) see black colour (3) distinguish between certain colours (4) have persistence of vision

Description : A colour-blind person cannot (1) see distant objects (2) see black colour (3) distinguish between certain colours (4) have persistence of vision

Last Answer : distinguish between certain colours

Magnifying glasses are useful, because they create an enlarged: w) virtual image behind the actual object. x) real image behind the actual object. y) virtual image in front of the actual object. z) real image in front of the actual object.

Description : Magnifying glasses are useful, because they create an enlarged: w) virtual image behind the actual object. x) real image behind the actual object. y) virtual image in front of the actual object. z) real image in front of the actual object.

Last Answer : ANSWER: W -- VIRTUAL IMAGE BEHIND THE ACTUAL OBJECT. 

Give reason: a) When we suddenly enter a cinema hall, we will not be able to see any objects.b) There is no image formation at blind spot.

Description : Give reason: a) When we suddenly enter a cinema hall, we will not be able to see any objects.b) There is no image formation at blind spot.

Last Answer : a) When we suddenly enter a cinema hall, we will not be able to see any objects. Our eyes take some time to adjust to the light in the surroundings. When we are in bright area pupil constricts. ... region where the optic nerve exits the eye ball. There are no sensory cells. Hence no image is formed.

On a fine sunny day a ship was in the harbor. All of a sudden the ship began to sink. There was no storm and nothing wrong with the ship yet it sank right in front of the spectators eyes. What caused the ship to sink? -Riddles

Description : On a fine sunny day a ship was in the harbor. All of a sudden the ship began to sink. There was no storm and nothing wrong with the ship yet it sank right in front of the spectators eyes. What caused the ship to sink? -Riddles

Last Answer : The 'Submarine' Captain ordered the crew to dive.

On a fine sunny day a ship was in the harbor. All of a sudden the ship began to sink. There was no storm and nothing wrong with the ship yet it sank right in front of the spectators eyes. What caused the ship to sink? -Riddles

Description : On a fine sunny day a ship was in the harbor. All of a sudden the ship began to sink. There was no storm and nothing wrong with the ship yet it sank right in front of the spectators eyes. What caused the ship to sink? -Riddles

Last Answer : It was a Submarine.

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not pass through the lens. (b) D - Choroid - Its anterior part forms ciliary body. (c) A - Retina - Contains photoreceptors, i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Description : Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not ... , i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Last Answer : (c) A - Retina - Contains photoreceptors, i.e., rods and cones.

A person who is nearsighted will need what type of lenses in his glasses in order to see correctly?

Description : A person who is nearsighted will need what type of lenses in his glasses in order to see correctly?

Last Answer : ANSWER: DIVERGING or CONCAVE LENSES

Vehicles use ______ to see the objects coming from behind. (1) Concave lens (2) Convex lens (3) Convex mirror (4) Concave mirror

Description : Vehicles use ______ to see the objects coming from behind. (1) Concave lens (2) Convex lens (3) Convex mirror (4) Concave mirror

Last Answer : (2) Convex lens Explanation: Convex mirror is used in rear view mirror of vehicles; so that the driver can see the traffic coming from behind. The field of view is widest in case of a convex mirror, which enables it to show a wider area from behind.

Vehicles use _____ to see the objects coming from behind. (1) Concave lens (2) Convex lens (3) Convex mirror (4) Concave mirror

Description : Vehicles use _____ to see the objects coming from behind. (1) Concave lens (2) Convex lens (3) Convex mirror (4) Concave mirror

Last Answer : Convex lens

In which of the following is a concave mirror used? (a) A solar cooker (b) A rear view mirror in vehicles (c) A safety mirror in shopping malls (d) In Viewing full size image of distant tall buildings.

Description : In which of the following is a concave mirror used? (a) A solar cooker (b) A rear view mirror in vehicles (c) A safety mirror in shopping malls (d) In Viewing full size image of distant tall buildings.

Last Answer : Answer : (a)

During burning of magnesium, we should wear sun glasses to protect our eyes from white dazzling light as it: (a) damage the retina (b) leads to loss of our vision (c) both (a) & (b) (d) none of these

Description : During burning of magnesium, we should wear sun glasses to protect our eyes from white dazzling light as it: (a) damage the retina (b) leads to loss of our vision (c) both (a) & (b) (d) none of these

Last Answer : (c) both (a) & (b)

Hyperrnetropia or longsight can be corrected by using : (1) Bifocal lenses (2) Cylindrical lenses (3) Concave lenses (4) Convex lenses

Description : Hyperrnetropia or longsight can be corrected by using : (1) Bifocal lenses (2) Cylindrical lenses (3) Concave lenses (4) Convex lenses

Last Answer : (4) Convex lenses Explanation: It can be corrected with convex lenses in eyeglasses or contact lenses. Convex lenses have a positive dioptric value, which causes the light to focus closer than its normal range.

Hypermetropia or longsight can be corrected by using : (1) Bifocal lenses (2) Cylindrical lenses (3) Concave lenses (4) Convex lenses

Description : Hypermetropia or longsight can be corrected by using : (1) Bifocal lenses (2) Cylindrical lenses (3) Concave lenses (4) Convex lenses

Last Answer : Convex lenses

Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror (ii) between the pole P and focus F of a concave mirror (iii) in front of a convex mirror (iv) at 2F of a convex lens (v) in front of a concave lens -Physics

Description : Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror (ii) between the pole P and focus F of ... front of a convex mirror (iv) at 2F of a convex lens (v) in front of a concave lens -Physics

Last Answer : Answer. Nature of image: Real, inverted and same size image is formed at the centre of curvature. Nature of image: Virtual, enlarged and erect image is formed behind the mirror. Nature of image: Virtual ... : Virtual, erect and diminished image is formed between O and F on the same side of object.

The focal length of a concave mirror is 2 meters. An object is positioned 8 meters in front of the mirror. Is the image of this object real or virtual?

Description : The focal length of a concave mirror is 2 meters. An object is positioned 8 meters in front of the mirror. Is the image of this object real or virtual? 

Last Answer : ANSWER: REAL

In an ideal case, if a point source of light is placed at the focal point in front of a concave reflector, where will the image form?

Description : In an ideal case, if a point source of light is placed at the focal point in front of a concave reflector, where will the image form?

Last Answer : ANSWER: WILL NOT FORM or FORMS AT INFINITY

The focal length of a concave mirror is 2 meters. An object is positioned 8 meters in front of the mirror. Where is the image of this object formed?

Description : The focal length of a concave mirror is 2 meters. An object is positioned 8 meters in front of the mirror. Where is the image of this object formed?

Last Answer : ANSWER: 8/3 METER or 2.66 METERS IN FRONT OF THE MIRROR

A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size, and his legs smaller than normal. The special mirror is made up of three types of mirrors in the following order from top downwards: (a) Convex, Plane, Concave (b) Plane, Convex, Concave (c) Concave, Plane, Convex (d) Convex, Concave, Plan

Description : A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size, and his legs smaller than normal. The ... , Plane, Concave (b) Plane, Convex, Concave (c) Concave, Plane, Convex (d) Convex, Concave, Plan

Last Answer : (c) Concave, Plane, Convex

In binocular vision: a. only points on the horopter fall on the corresponding retinal point b. points in front of the horopter will stimulate binasal retina c. points outside the horopter is perceived doubly d. the Panum's fusional area is wider in the centre than the periphery e. sensory fusion refers to the cortical integration of images perceived by the two eyes

Description : In binocular vision: a. only points on the horopter fall on the corresponding retinal point b. points in front of the horopter will stimulate binasal retina c. points outside the horopter ... the periphery e. sensory fusion refers to the cortical integration of images perceived by the two eyes

Last Answer : only points on the horopter fall on the corresponding retinal point

What is a compound microscope? (1) A microscope that has one lens. (2) A microscope that has two sets of lenses : an occular lens and an eyepiece. (3) A microscope whose lenses are concave. (4) A microscope whose lenses are convex.

Description : What is a compound microscope? (1) A microscope that has one lens. (2) A microscope that has two sets of lenses : an occular lens and an eyepiece. (3) A microscope whose lenses are concave. (4) A microscope whose lenses are convex.

Last Answer : (2) A microscope that has two sets of lenses : an occular lens and an eyepiece. Explanation: A compound microscope is a microscope which uses multiple lenses to collect light from the ... lens provides the primary magnification which is compounded (multiplied) by the ocular lens (eyepiece).

Which one of the following lenses should be used to correct the defect of astigmatism? (1) Cylindrical lens (2) Concave lens (3) Convex lens (4) Bifocal lens

Description : Which one of the following lenses should be used to correct the defect of astigmatism? (1) Cylindrical lens (2) Concave lens (3) Convex lens (4) Bifocal lens

Last Answer : (1) Cylindrical lens Explanation: Astigmatism is an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image ... lens, and cannot be corrected by standard spectacle lenses, but can be corrected by contact lenses.

What is a compound microscope? (1) A microscope that has one lens. (2) A microscope that has two sets of lenses : an occular lens and an eyepiece. (3) A microscope whose lenses are concave. (4) A microscope whose lenses are convex.

Description : What is a compound microscope? (1) A microscope that has one lens. (2) A microscope that has two sets of lenses : an occular lens and an eyepiece. (3) A microscope whose lenses are concave. (4) A microscope whose lenses are convex.

Last Answer : A microscope that has two sets of lenses : an occular lens and an eyepiece.

Which one of the following lenses should be used to correct the defect of astigmatism ? (1) Cylindrical lens (2) Concave lens (3) Convex lens (4) Bifocal lens

Description : Which one of the following lenses should be used to correct the defect of astigmatism ? (1) Cylindrical lens (2) Concave lens (3) Convex lens (4) Bifocal lens

Last Answer : Cylindrical lens

If someone dies with their eyes open does the lens still focus an image on the retina?

Description : If someone dies with their eyes open does the lens still focus an image on the retina?

Last Answer : I’m sure it does until the brain stops being able to process that image.. making it a moot point.

When viewing an object near to your eyes the following are required for proper image formation of the retina ? (A) Contraction of the ciliary muscles

Description : When viewing an object near to your eyes the following are required for proper image formation of the retina ? (A) Contraction of the ciliary muscles

Last Answer : When viewing an object near to your eyes the following are required for proper image formation of the retina ? (A) ... and D C. B and D D. A and B

An object is located 1 meter in front of a converging lens having a focal length of 20 centimeters. At what distance behind the lens (whose thickness is negligible) will the image be formed? w) 18 centimeters x) 20 centimeters y) 22 centimeters z) 25 centimeters

Description : An object is located 1 meter in front of a converging lens having a focal length of 20 centimeters. At what distance behind the lens (whose thickness is negligible) will the image be formed? w) 18 centimeters x) 20 centimeters y) 22 centimeters z) 25 centimeters

Last Answer : ANSWER: Z -- 25 CENTIMETERS

The purpose behind the painting ―The Massacre at Chios‖ by Eugene Delacroix, 1824, was: a To appeal to the emotions of the spectators and create sympathy for the Greeks b. To dramatize the incident in which 20,000 Greeks were killed c. To focus on the suffering of women and children d. All the above

Description : The purpose behind the painting ―The Massacre at Chios‖ by Eugene Delacroix, 1824, was: a To appeal to the emotions of the spectators and create sympathy for the Greeks b. To dramatize the incident in which 20,000 Greeks were killed c. To focus on the suffering of women and children d. All the above

Last Answer : d. All the above

If we are looking into the past when we look at distant stars, doesn't that mean that when we look at objects in everyday life we see them as they were a moment ago?

Description : If we are looking into the past when we look at distant stars, doesn't that mean that when we look at objects in everyday life we see them as they were a moment ago?

Last Answer : Strictly speaking, yes, that’s true. Light is a physical stuff that takes time to travel. Of course, the delay is so small it’s only worth taking into account with things as insanely far away as stars, and maybe the other planets.

Distant objects are visible as a little out of focus in this condition – (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Description : Distant objects are visible as a little out of focus in this condition – (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Last Answer : (4) myopia Explanation: Myopia, also known as nearsightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing ... at a distant object to be out of focus, but in focus when looking at a close object.

The instrument used to see the distant objects on the Earth is – (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Description : The instrument used to see the distant objects on the Earth is – (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Last Answer : (1) Terrestrial telescope Explanation: A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; ... organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.

Distant objects are visible as a little out of focus in this condition : (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Description : Distant objects are visible as a little out of focus in this condition : (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Last Answer : myopia

The instrument used to see the distant objects on the Earth is (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Description : The instrument used to see the distant objects on the Earth is (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Last Answer : Terrestrial telescope

14. An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the -Chemistry-10

Description : 14. An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the -Chemistry-10

Last Answer : Answer. hope this helps you

2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located? -Physics-10

Description : 2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located? -Physics-10

Last Answer : Magnification produced by a spherical mirror: Object distance (u) = – 10 cm v = 3 × (- 10) = – 30 cm Therefore, the negative sign indicates that an inverted image is formed in front of the given concave mirror at a distance of 30 cm.

An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror. -Science

Description : An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror. -Science

Last Answer : Here, radius of curvature of concave mirror, R = 30 cm. Therefore, focal length of the mirror, f = R/2 = 30/2 = 15 cm Also, object distance, u = 12 cm Hence, knowing the focal length of mirror and ... (i) Erect (ii) Larger in size than that of the object (iii) Virtual and (iv) Behind the mirror.

A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases for obtaining the images. -Science

Description : A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases for obtaining the images. -Science

Last Answer : For magnified and erect image the object is placed between pole P and focus F. For magnified and inverted image the object is placed either at focus or anywhere between F and C.

Find the position of an object which when placed in front of a concave mirror of focal length 20 cm, produces a virtual image which is twice the size

Description : Find the position of an object which when placed in front of a concave mirror of focal length 20 cm, produces a virtual image which is twice the size

Last Answer : Find the position of an object which when placed in front of a concave mirror of focal length 20 cm ... image which is twice the size of the object.

You want to put up a mirror at a blind corner in a building. Which of the following will give you the largest field of view? Is it a: w) convex mirror x) concave mirror y) cylindrical mirror z) plane mirror

Description : You want to put up a mirror at a blind corner in a building. Which of the following will give you the largest field of view? Is it a: w) convex mirror x) concave mirror y) cylindrical mirror z) plane mirror

Last Answer : ANSWER: W -- CONVEX MIRROR

If I wanted to try contact lenses, could I just order some on Amazon, using the dioptric values of my current glasses?

Description : If I wanted to try contact lenses, could I just order some on Amazon, using the dioptric values of my current glasses?

Last Answer : None of the ones on Amazon are prescription that I’m aware of. Did you find some that asked for your vision prescription?

Can I use glasses in front of computer all the time ? You have to work on the computer all the time. I know there is a lot of damage to the eyes , but what to do. I want to use one type of spectacles to reduce eye damage. What kind of glasses do I use to reduce the damage to my eyes ?? I would be happy to say the price of the glasses , please.

Description : Can I use glasses in front of computer all the time ? You have to work on the computer all the time. I know there is a lot of damage to the eyes , but what to do. I want to use one type of ... use to reduce the damage to my eyes ?? I would be happy to say the price of the glasses , please.

Last Answer : I myself use computer for 8 hours even if it is less throughout the day. I have been using computer for 10 years , Alhamdulillah I have no problem. If you keep your eyes closed for half an ... the market. Price 1200-1500 rupees If you have symptoms like headache , blurred vision, consult a doctor.

What exact model are those goggles/sun glasses, that Jack O'Neill often wears on Stargate SG1?

Description : What exact model are those goggles/sun glasses, that Jack O'Neill often wears on Stargate SG1?

Last Answer : They are Vuarnet GlacierSunglasses or possibly Bolle brand Bugaboo Glacier glasses. Glacier glasses are know for having the leather sideguards that prevent reflected light from coming in.

How come Lois Lane doesn't know that Clark is Superman when all that is different is that he wears glasses?

Description : How come Lois Lane doesn't know that Clark is Superman when all that is different is that he wears glasses?

Last Answer : Because it’s a comic book. The fact that it features an alien who was sent to this planet, where a yellow sun makes him able to fly and see through walls and shoot laser beams from his eyes doesn’t bother him, but a dimwitted reporter not seeing through a terrible disguise does?

A person who can see distant objects clearly but cannot see nearby objects distinctly is suffering from which eye disease?

Description : A person who can see distant objects clearly but cannot see nearby objects distinctly is suffering from which eye disease?

Last Answer : Hypermetropia.

______ is the defect which occurs in eye due to excessive curvature of cornea and person is not able to see distant objects clearly . a)myopia b)hypermetropia c)squint d)cataract

Description : ______ is the defect which occurs in eye due to excessive curvature of cornea and person is not able to see distant objects clearly . a)myopia b)hypermetropia c)squint d)cataract

Last Answer : a)myopia

To create an enlarged real image using a concave mirror, the object must be placed: w) beyond the center of curvature. x) between the center and the focus. y) at the focus. z) closer than the focus.

Description : To create an enlarged real image using a concave mirror, the object must be placed: w) beyond the center of curvature. x) between the center and the focus. y) at the focus. z) closer than the focus.

Last Answer : ANSWER: X -- BETWEEN THE CENTER AND THE FOCUS.

It is dangerous to observe solar eclipse with naked eyes because – (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Description : It is dangerous to observe solar eclipse with naked eyes because – (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Last Answer : (2) Ultraviolet radiations from Sun burn our retina Explanation: The solar radiation that reaches the surface of Earth ranges from ultraviolet (UV) radiation at wavelengths longer than 290 nm to radio ... of the Sun during an eclipse is for the development of "eclipse blindness" or retinal burns.