How many times does a ray pass through a thick lens ?

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When a ray passes through a thick lens, it is refracted twice.
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Before X-ray examination (coloured Xray) of the stomach, patients are given suitable salt of barium because. (1) barium is a good absorber of X-rays and helps stomach to appear clearly (2) barium salts are white in colour and this helps stomach to appear clearly (3) barium allows X-rays to pass through the stomach (4) barium salts are easily available

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Last Answer : (1) barium is a good absorber of X-rays and helps stomach to appear clearly

A convex lens has a focal length of 10 cm. At what distance from the lens should the object be placed so that it forms a real and inverted image 20 cm away from the lens? What would be the size of the image formed if the object is 2 cm high? With the help of a ray diagram show the formation of the image by the lens in this case. -Physics

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Last Answer : This is the Answe:

An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a convex lens at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the screen. What is the focal length of the convex lens and size of the image formed on the screen? Draw a ray diagram to show the formation of the image in this position of the object with respect to the lens. -Physics

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Last Answer : Since, object-screen distance is double of object-lens separation, the object is at a distance of 2f from the lens and the image should be of the same size of the object.

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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.

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For a ray of light to suffer total internal reflection it has to pass from – (1) glass to water (2) water to glass (3) air to water (4) air to glass

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Last Answer : (3) air to water Explanation: Total internal reflection is an optical phenomenon that happens when a ray of light strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.

For a ray of light to suffer total internal reflection it has to pass from : (1) glass to water (2) water to glass (3) air to water (4) air to glass

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Last Answer : air to water

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

For total internal reflection, ray of Light Has to pass through

Description : For total internal reflection, ray of Light Has to pass through

Last Answer : Glass to water

The metal which does not allow X-ray to pass through?

Description : The metal which does not allow X-ray to pass through?

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12. Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed: -Chemistry-10

Description : 12. Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed: -Chemistry-10

Last Answer : Answer. hope this helps you

11. A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. -Physics-10

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Last Answer : Focal length of concave lens (OF1), f = – 15 cm Image distance, v= – 10 cm According to the lens formula, The negative value of u indicates that the object is placed 30 cm in front of the lens. This is shown in the following ray diagram.

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Last Answer : Height of the Object, h0 = 5 cm Distance of the object from converging lens, u = -25 cm Focal length of a converging lens, f = 10 cm Using lens formula, Thus, the image is inverted and formed at a distance of 16.7 cm behind the lens and measures 3.3 cm. The ray diagram is shown below.

Ray coming from an object situated at infinity, fall on a convex lens and an image is formed at a distance of 16 cm from the lens. When a concave lens

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When a slide is placed 15 cm behind the lens in a projector, an image is formed at 3 infront of the lens. (i) Show the image formation by a ray diagra

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X-ray diffraction can be observed by using __________. A. Diffraction Grating B. Rock salt crystal C. Convex lens D. Michelson’s interferometer

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If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is A. thrice the Earth's magnetic flux density B. four times the Earth's magnetic flux density C. five times the Earth's magnetic flux density D. twice the Earth's magnetic flux density

Description : If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is A. thrice the Earth's magnetic flux density B. four times the Earth ... C. five times the Earth's magnetic flux density D. twice the Earth's magnetic flux density

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A proton and an alpha particle pass through the gap of a strong magnet. If both particles have the same initial velocity, how many times greater will the defection of the proton be relative to the deflection of the alpha particle? Will it be: w) the same x) 2 times y) 4 times z) 8 times

Description : A proton and an alpha particle pass through the gap of a strong magnet. If both particles have the same initial velocity, how many times greater will the defection of the proton be relative to the deflection of the alpha particle? Will it be: w) the same x) 2 times y) 4 times z) 8 times

Last Answer : ANSWER: X -- 2 TIMES

If a person looking through microscope at the full moon, how would the appearance of moon be changed by covering of objective lens?

Description : If a person looking through microscope at the full moon, how would the appearance of moon be changed by covering of objective lens?

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When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is - (1) the violet ray (2) the red ray (3) the green ray (4) the blue ray

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When light enters an optically denser medium, the light ray: w) bends away from a normal to surface x) passes through unbent y) bends towards a normal to surface z) none of the above

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Last Answer : ANSWER: Y -- BENDS TOWARDS A NORMAL TO SURFACE

An incident ray comes in parallel to the principle axis of a concave mirror. Is it reflected: w) back along the incident ray x) at 30 degrees to incident ray y) through the focal point z) through the center of curvature

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Last Answer : ANSWER: Y -- THROUGH THE FOCAL POINT 

Why does dust fall from the blanket when it is hit with a cane while hanging a thick blanket ?

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When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

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A wooden board 2 meters long, 30 centimeters wide and 4 centimeters thick floats in water with 1 centimeter of its thickness above the surface. The mass of the board is: w) 1.8 kilograms x) 18 kilograms y) 24 kilograms z) 176 kilograms

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Last Answer : ANSWER: X -- 18 KILOGRAMS

When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

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Last Answer :  is a bad conductor of heat so only inner surface expands 

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Last Answer : Air layer between two shirts behaves like insulating media

If in a motion, the axis of the rotation does not pass through the object, then the motion is called - (1) Spin motion (2) Oscillatory motion (3) Translatory motion (4) Orbital motion

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When a strong beam of light is passed through a colloidal solution, the light will – (1) be scattered (2) pass unchanged (3) be absorbed (4) be reflected

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What name is given to the visible light emitted when charged particles pass through a transparent medium with a velocity exceeding the velocity of light in the medium?

Description : What name is given to the visible light emitted when charged particles pass through a transparent medium with a velocity exceeding the velocity of light in the medium?

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In the mass spectrograph, two positively charged ions having the same velocity pass through a slit and enter a uniform magnetic field at right angles to their initial velocities. The ions will NOT be separated if: w) they have the same masses but different charges x) they have the same charges but different masses y) the products of their charges and their masses are equal z) the ratios of their charges to their masses are equal

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Last Answer : ANSWER: Z -- THE RATIOS OF THEIR CHARGES TO THEIR MASSES ARE EQUAL 

Magnetic lines of force have all but one of the following characteristics. The one that they DO NOT have is: w) they go from the South-pole to the North-pole of a magnet outside of the magnet x) they are most concentrated at the poles of a magnet y) they pass through copper z) they never cross one another

Description : Magnetic lines of force have all but one of the following characteristics. The one that they DO NOT have is: w) they go from the South-pole to the North-pole of a magnet outside of the magnet ... most concentrated at the poles of a magnet y) they pass through copper z) they never cross one another

Last Answer : ANSWER: W -- THEY GO FROM THE SOUTH-POLE TO THE NORTH-POLE OF THE M AGNET 

When a strong beam of light is passed through a colloidal solution, the light will (1) be scattered (2) pass unchanged (3) be absorbed (4) be reflected

Description : When a strong beam of light is passed through a colloidal solution, the light will (1) be scattered (2) pass unchanged (3) be absorbed (4) be reflected

Last Answer : be scattered

Sound cannot pass through (1) water (2) steel (3) air (4) vacuum

Description : Sound cannot pass through (1) water (2) steel (3) air (4) vacuum

Last Answer : vacuum

Why is my hair sometimes quite thick, and at other times seems thin?

Description : Why is my hair sometimes quite thick, and at other times seems thin?

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In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger. (A) Once (B) Twice (C) Thrice (D) Four times

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Those blood cells you can see when you look at the sky--are those in the lens of your eye, or the retina, or where?

Description : Those blood cells you can see when you look at the sky--are those in the lens of your eye, or the retina, or where?

Last Answer : Do you mean ‘floaters’? https://www.mayoclinic.org/diseases-conditions/eye-floaters/symptoms-causes/syc-20372346

An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens. -Physics

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Last Answer : The focal length' of convex length is 7.14 cm. Solution: The given quantities are Height of the object h = 50 cm Height of the image formed h' = -20 cm Image distance v = 10 cm The image ... object distance will be So the focal length will be Thus the focal length of the convex lens is 7.14 cm

A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. -Physics

Description : A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. -Physics

Last Answer : Answer. I hope it helped you.

Who was the originator of the lens formula ?

Description : Who was the originator of the lens formula ?

Last Answer : Newton was the originator of the lens formula.

What is Lens Addition or Cooperative ?

Description : What is Lens Addition or Cooperative ?

Last Answer : Multiple lenses can be placed in contact with each other in such a way that their main axes are in the same straight line. Multiple lenses that are in such contact with each other are called a combination of lenses.

What is an Apsari Lens ?

Description : What is an Apsari Lens ?

Last Answer : A lens whose center is narrow and whose side is thick is called concave or divergent lens.

What is a converging lens ?

Description : What is a converging lens ?

Last Answer : A lens whose center is thick and whose edges are relatively narrow is called convex or converging lens.

What is a lens ?

Description : What is a lens ?

Last Answer : A transparent refractive medium bounded by two spherical surfaces is called a lens.

How do I identify a lens without touching it ?

Description : How do I identify a lens without touching it ?

Last Answer : If you place a finger very close to the front of the lens and look from the other side, if you see a straight and large image of the finger, then the lens is convex. If the image is straight and small in size, then the lens is concave.

Lens Power - What Does 2D Mean ?

Description : Lens Power - What Does 2D Mean ?

Last Answer : The power of the lens -2D means the lens is concave and its focal length is 1/2 meter.

What is a convex lens ?

Description : What is a convex lens ?

Last Answer : A convex lens is a lens that has a thick center and a narrow end.