Description : A 50 millimeter focal length camera lens photographs a 4 meter tall tree at a distance of 20 meters. How tall is the image of the tree?
Last Answer : ANSWER: 10 MILLIMETERS
Description : Which one of the following determines the sharpness of image in a camera? (1) The aperture (2) The exposure time (3) The focal length of the lens (4) Size of the camera
Last Answer : (1) The aperture Explanation: Image quality is a characteristic of an image that measures the perceived image degradation (typically, compared to an ideal or perfect image). Imaging systems may ... assessment is an important problem. Sharpness determines the amount of detail an image can convey.
Description : Which one of the following determines the sharpness of image in a camera ? (1) The aperture (2) The exposure time (3) The focal length of the lens (4) Size of the camera
Last Answer : The aperture
Description : Magnification of compound microscope is not connected with (a) numerical aperture (b) focal length of objective (c) focal length of eye piece (d) tube length.
Last Answer : (a) numerical aperture
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
Description : Where should an object be placed from a converging lens of focal length 10 c, so as to obtain a virtual image of magnification 2 ?
Last Answer : Where should an object be placed from a converging lens of focal length 10 c, so as to obtain a virtual image of magnification 2 ?
Description : Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real image of magnification 2?
Last Answer : Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real image of magnification 2?
Description : Magnifying power of a simple microscope can be increased by ? A. increasing focal length of the lens B. Decreasing focal length of the lens (Answer) C. Lens of large aperture D. lens of short aperture E. None of these
Last Answer : B. Decreasing focal length of the lens (Answer)
Description : What is the wavelength in millimeters of a sound wave whose frequency is 35 KILOHERTZ. Assume the speed of sound is 350 METERS PER SECOND? w) 100 millimeters x) 1,000 millimeters y) 10 millimeters z) 1/10 millimeters
Last Answer : ANSWER: Y -- 10 MILLIMETERS
Description : 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
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
Description : The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens? -Do You Know?
Last Answer : P=100/f (in cms) =100/5 1m= 100cm 0.2m= 20cm Hence,the power is 0.2 D The lens is convex as it is positive
Description : The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens?
Last Answer : + 20 D
Description : Will the Sony DSC-T90 Cyber-shot use the lens from my 35mm Minolta?
Last Answer : No, digital and film cameras have different size focus points.
Description : To increase the magnifying power of telescope, we should increase (a) The focal length of the objective (b) The focal length of the eyepiece (c) Aperture of the objective (d) Aperture of the eyepiece
Last Answer : Ans:(a)
Description : Which part of the camera is analogue to the retina in the human eye? A. Lens B. Film C. Aperture D. Shutter
Last Answer : ANSWER: B
Description : Which part of the camera is analogous to the retina in the human eye? (a) Lens (b) Film (c) Aperture (d) Shutter
Last Answer : Ans:(b)
Description : Which part of the Camera is analogue to the retina in the human eye? A. Lens B. Film (Answer) C. Aperture D. Shutter
Last Answer : B. Film (Answer)
Description : The tectonic plates on which India and the adjacen portion of Asia ride are colliding at a rate of: w) 1-10 millimeters per year x) 1-10 centimeters per year y) 1-10 meters per year z) 1-10 decimeters per year
Last Answer : ANSWER: X -- 1-10 CENTIMETERS PER YEAR
Description : 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
Last Answer : ANSWER: Y -- THROUGH THE FOCAL POINT
Description : 2. 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. [All India] -Chemistry-10
Last Answer : this is the answer for the respected question
Description : The focal length of a convex lens is 50 cm. what is its power? -Do You Know?
Last Answer : convex ( so focal length is positive ) given : f = 50cm or +50×10^-2m so find p =? formula p =1/f p = 1/50×10^-2 p= 100/50 P = 2
Description : The power of a convex lens is +2.5. Then its focal length is (a) 20 cm (b) 50 cm (c) 30 cm (d) 40 cm
Last Answer : Ans:(d)
Description : The focal length of a convex lens is 50 cm. what is its power?
Last Answer : +2 D
Description : A converging lens forms a three times magnified image of an object, which can be take on a screen. If the focal length of the lens is 30 cm, then the distance of the object from the lens is (a) - 55 cm (b) - 50 cm (c) - 45 cm (d) - 40 cm
Last Answer : (d) - 40 cm
Description : In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is (A) 5.24 cm (B) 6.24 cm (C) 7.24 cm (D) 8.24 cm
Last Answer : (C) 7.24 cm
Description : Diopter is the power of a lens having a focal length of (A) 25 cm (B) 50 cm (C) 75 cm (D) 100 cm
Last Answer : (D) 100 cm
Description : 1. The focal length of a convex lens is 50 cm. what is its power? 2. Among the Indian languages, which one is spoken maximum in the world after Hindi? 3. Which formulates fiscal policy? 4. ... Sun (in million kms.)? 20. Upanishads, also known as the Vedantas, are How many are these upanishads?
Last Answer : Answer : 1. +2 D 2. Bengali 3. Finance Ministry 4. China-Pakistan5. Lord Ellenborough 6. Leaf 7. Advocate General 8. Lithium and osmium 9. Chenab 10. Indigo 11. Canada 12. The Mellanesia 13. Leaf 14. Black 15. Atharvaveda 16. President 17. Roentgens 18. Third Plan 19. 149 20. 108
Description : A sphere of 1 cm radius is placed at the distance of 50 cm from the convex lens of 10 cn focal length. What would be the height of the image of sphere ?
Last Answer : 0.5cm
Description : A round viewing window with a 20 centimeter diameter is installed in a tank at the Shedd Aquarium. It is 5 meters below the water surface. The force on the window is approximately: w) 1,500 Newtons x) 10,000 Newtons y) 25,000 Newtons z) 50,000 Newtons
Last Answer : ANSWER: W -- 1,500 NEWTONS
Description : The focal length of a concave-convex lens of radii of curvature 5 cm and 10 cm is 20 cm. what will be its focal length in water ? Given `.^(a)mu_(w) =
Last Answer : The focal length of a concave-convex lens of radii of curvature 5 cm and 10 cm is 20 cm. what will be its ... water ? Given `.^(a)mu_(w) = 4//3`.
Description : 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 ... ? With the help of a ray diagram show the formation of the image by the lens in this case. -Physics
Last Answer : This is the Answe:
Description : 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 ... diagram to show the formation of the image in this position of the object with respect to the lens. -Physics
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.
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.
Description : + What is the focal length of a lens of ID capacity ?
Last Answer : + 1D is the focal length of a lens of power f = 1 / p = 1/1 = 1 [ Here f is the focal length , p is the power of the lens]
Description : What is the power of a lens if the focal length of a lens is + 0.1 m ?
Last Answer : If the focal length of a lens is + 0.1 m then the power of that lens will be p = 1 / f = 1 / 0.1 = 10 D [ here p power , f focus distance]
Description : What is the focal length of a +5d capable lens ?
Last Answer : We know that power is P = 1 / f hence the distance distance f = 1 / p = 1/5 = 0.2 m
Description : What is the power of a convex lens with a focal length of 20 cm ?
Last Answer : 20cm = 0.2 m We know , power p = 1 / f = 1 / 0.2 = + 5 D
Last Answer : : The distance between the center of a lens and the main focus is called the focal length of that lens.
Description : An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed? (1) 20 cm (2) 15 cm (3) 30 cm (4) 10 cm
Last Answer : (2) 15 cm
Description : Dioptere is the unit of – (1) power of a lens (2) focal length of a lens (3) light intensity (4) sound intensity
Last Answer : (1) power of a lens
Description : The measured distance from a lens to the object is 20 cm and from the lens to the image is 5 cm. Calculate the focal length
Last Answer : 1/4
Description : A converging thin lens has a focal length of 27 centimeters. An object is placed 9 centimeters from the lens. Is the image of the object real or virtual?
Last Answer : ANSWER: VIRTUAL
Description : Suppose the power of a prescription lens is 4 diopters. What is the focal length of the lens?
Last Answer : ANSWER: = 25 CENTIMETERS
Description : A converging thin lens has a focal length of 27 centimeters. An object is placed 9 centimeters from the lens. Where is the image of this object formed?
Last Answer : ANSWER: -13.5 CENTIMETERS or 13.5 CENTIMETERS ON THE OBJECT SIDE OF THE LENS
Description : Dioptere is the unit of (1) power of a lens (2) focal length of a lens (3) light intensity (4) sound intensity
Last Answer : power of a lens
Description : When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because (1) the eye muscles cannot immediately adjust the focal length of the eye ... is unable to contract the pupil immediately. (4) the iris is unable to dilate the pupil immediately.
Last Answer : the iris is unable to dilate the pupil immediately.
Description : By which one of the following can a real image be produced? Can it be produced by a: w) concave mirror x) plane mirror y) diverging lens z) convex mirror
Last Answer : ANSWER: W -- CONCAVE MIRROR
Description : A thin double-concave lens produces images which are: w) larger than the object x) smaller than the object y) the same size as the object z) one cannot tell from this information
Last Answer : ANSWER: X -- SMALLER THAN THE OBJECT
Description : What do you understand by linear magnification and angular magnification? Explain how a convex lens is used as a magnifier?
Last Answer : Linear Magnification: The ratio of the size of image to the size of object is called linear magnification. Angular magnification: The ratio of the angle subtended by the image as seen through the optical ... lens used as a magnifier when an object is brought within the focal length of convex lens.
Description : Can you explain the difference between a prime/fixed focal length lens and one where the focal length can be varied?
Last Answer : With a zoom lens, you can change the focal length to zoom in or out (there's a proper name for it but it escapes me). With a prime lens, it's fixed - no zoom. Because prime lenses are ... a zoom.. You'd just use them differently and get slightly different results. I think Pros only use prime lenses.