20 + Interview Questions in GENERAL QA IN IMAGES Page 1 InterviewSolution

1.	What type of eyeglasses should a nearsighted person wear? A. diverging lenses B. bifocal lenses C. converging lenses D. plano-convex lenses E. double convex lenses
Answer» A. diverging lenses

Discussion

2.	A nearsighted person can see clearly only objects within 1.4 m of her eye. To see distant objects, she should wear eyeglasses of what type and focal length? A. diverging, 2.8 m B. diverging, 1.4 m C. converging, 2.8 m D. converging, 1.4 m E. diverging, 0.72 m
Answer» B. diverging, 1.4 m

Discussion

3.	A convex spherical refracting surface separates a medium with index of refraction 2 from air. The image of an object outside the surface is real: A. always B. neverC. only if it is close to the surface D. only if it is far from the surface E. only if the radius of curvature is small
Answer» D. only if it is far from the surface

Discussion

4.	A convex spherical surface with radius r separates a medium with index of refraction 2 from air. As an object is moved toward the surface from far away along the central axis, its image: A. changes from virtual to real when it is r/2 from the surface B. changes from virtual to real when it is r from the surface C. changes from real to virtual when it is r/2 from the surface D. changes from real to virtual when it is r from the surface E. remains real
Answer» D. changes from real to virtual when it is r from the surface

Discussion

5.	A concave refracting surface of a medium with index of refraction n produces a real image no matter where an object is placed outside: A. always B. only if the index of refraction of the surrounding medium is less than n C. only if the index of refraction of the surrounding medium is greater than n D. never E. none of the above
Answer» E. none of the above

Discussion

6.	A hollow lens is made of thin glass, as shown. It can be filled with air, water (n = 1.3) or CS2 (n = 1.6). The lens will diverge a beam of parallel light if it is filled with:A. air and immersed in air B. air and immersed in water C. water and immersed in CS2 D. CS2 and immersed in water E. CS2 and immersed in CS2
Answer» D. CS₂ and immersed in water

Discussion

7.	A concave spherical surface with radius r separates a medium with index of refraction 2 from air. As an object is moved toward the surface from far away along the central axis, its image: A. changes from virtual to real when it is r/2 from the surface B. changes from virtual to real when it is 2r from the surface C. changes from real to virtual when it is r/2 from the surface D. changes from real to virtual when it is 2r from the surface E. remains virtual
Answer» E. remains virtual

Discussion

8.	An ordinary magnifying glass in front of an erect object produces an image that is: A. real and erect B. real and inverted C. virtual and inverted D. virtual and erect E. none of these
Answer» D. virtual and erect

Discussion

9.	A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. To obtain light with rays parallel to the central axis after refraction a point source should be placed on the axis: A. 3 cm from the surface B. 6 cm from the surface C. 12 cm from the surface D. 18 cm from the surface E. 24 cm from the surface
Answer» C. 12 cm from the surface

Discussion

10.	Which of the following is NOT correct for a simple magnifying glass? A. The image is virtual B. The image is erect C. The image is larger than the object D. The object is inside the focal pointE. The lens is diverging
Answer» E. The lens is diverging

Discussion

11.	An erect object is located between a concave mirror and its focal point. Its image is: A. real, erect, and larger than the object B. real, inverted, and larger than the object C. virtual, erect, and larger than the object D. virtual, inverted, and larger than the object E. virtual, erect, and smaller than the object
Answer» C. virtual, erect, and larger than the object

Discussion

12.	An erect object is placed on the central axis of a thin lens, further from the lens than the magnitude of its focal length. The magnification is +0.4. This means: A. the image is real and erect and the lens is a converging lens B. the image is real and inverted and the lens is a converging lens C. the image is virtual and erect, and the lens is a diverging lens D. the image is virtual and erect, and the lens is a converging lens E. the image is virtual and inverted and the lens is a diverging lens
Answer» C. the image is virtual and erect, and the lens is a diverging lens

Discussion

13.	The image produced by a convex mirror of an erect object in front of the mirror is always: A. virtual, erect, and larger than the object B. virtual, erect, and smaller than the object C. real, erect, and larger than the object D. real, erect, and smaller than the object E. none of the above
Answer» B. virtual, erect, and smaller than the object

Discussion

14.	Real images formed by a spherical mirror are always: A. on the side of the mirror opposite the source B. on the same side of the mirror as the source but closer to the mirror than the source C. on the same side of the mirror as the source but closer to the mirror than the focal point D. on the same side of the mirror as the source but further from the mirror than the focal point E. none of the above
Answer» E. none of the above

Discussion

15.	A parallel beam of monochromatic light in air is incident on a plane glass surface. In the glass, the beam: A. remains parallel D. undergoes dispersion B. becomes diverging E. follows a parabolic path C. becomes converging
Answer» A. remains parallel

Discussion

16.	A card marked IAHIO8 is standing upright in front of a plane mirror. Which of the following is NOT true? A. The image is virtualB. The image shifts its position as the observer shifts his position C. The image appears as 8OIHAI to a person looking in the mirror D. The image is caused mostly by specular rather than diffuse reflection E. The image is the same size as the object
Answer» B. The image shifts its position as the observer shifts his position

Discussion

17.	An object is 2 m in front of a plane mirror. Its image is: A. virtual, inverted, and 2 m behind the mirror B. virtual, inverted, and 2 m in front of the mirror C. virtual, erect, and 2 m in front of the mirror D. real, erect, and 2 m behind the mirror E. none of the above
Answer» E. none of the above

Discussion

18.	A man holds a rectangular card in front of and parallel to a plane mirror. In order for him to see the entire image of the card, the least mirror area needed is: A. that of the whole mirror, regardless of its size B. that of the pupil of his eye C. one-half that of the card D. one-fourth that of the card E. an amount which decreases with his distance from the mirror
Answer» D. one-fourth that of the card

Discussion

19.	Where must an object be placed in front of a converging lens in order to obtain a virtual image? A. At the focal point B. At twice the focal length C. Greater than the focal length D. Between the focal point and the lens E. Between the focal length and twice the focal length
Answer» D. Between the focal point and the lens

Discussion

20.	Which instrument uses a single converging lens with the object placed just inside the focal point? A. Camera B. Compound microscope C. Magnifying glass D. Overhead projector E. Telescope
Answer» C. Magnifying glass

Discussion

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What type of eyeglasses should a nearsighted person wear? A. diverging lenses B. bifocal lenses C. converging lenses D. plano-convex lenses E. double convex lenses

A nearsighted person can see clearly only objects within 1.4 m of her eye. To see distant objects, she should wear eyeglasses of what type and focal length? A. diverging, 2.8 m B. diverging, 1.4 m C. converging, 2.8 m D. converging, 1.4 m E. diverging, 0.72 m

A convex spherical refracting surface separates a medium with index of refraction 2 from air. The image of an object outside the surface is real: A. always B. neverC. only if it is close to the surface D. only if it is far from the surface E. only if the radius of curvature is small

An ordinary magnifying glass in front of an erect object produces an image that is: A. real and erect B. real and inverted C. virtual and inverted D. virtual and erect E. none of these

Which of the following is NOT correct for a simple magnifying glass? A. The image is virtual B. The image is erect C. The image is larger than the object D. The object is inside the focal pointE. The lens is diverging

The image produced by a convex mirror of an erect object in front of the mirror is always: A. virtual, erect, and larger than the object B. virtual, erect, and smaller than the object C. real, erect, and larger than the object D. real, erect, and smaller than the object E. none of the above

A parallel beam of monochromatic light in air is incident on a plane glass surface. In the glass, the beam: A. remains parallel D. undergoes dispersion B. becomes diverging E. follows a parabolic path C. becomes converging

An object is 2 m in front of a plane mirror. Its image is: A. virtual, inverted, and 2 m behind the mirror B. virtual, inverted, and 2 m in front of the mirror C. virtual, erect, and 2 m in front of the mirror D. real, erect, and 2 m behind the mirror E. none of the above

Where must an object be placed in front of a converging lens in order to obtain a virtual image? A. At the focal point B. At twice the focal length C. Greater than the focal length D. Between the focal point and the lens E. Between the focal length and twice the focal length

Which instrument uses a single converging lens with the object placed just inside the focal point? A. Camera B. Compound microscope C. Magnifying glass D. Overhead projector E. Telescope