Lenses Quiz | Lenses Objective Type Questions and Answers

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Questions
21 Dental mirror is what type of a mirror?
A Convex mirror
B Concave mirror
C Plane mirror
D Both (b) and (c)

Answer: Both (b) and (c)
22 Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?
A 0.50 m
B 2 m
C half of your height
D twice your height

Answer: half of your height
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23 A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a :
A converging lens
B diverging lens
C plano-converging lens
D plano-diverging lens

Answer: diverging lens
24 What is the power of the lens, if the far point of a short-sighted eye is 200 cm?
A -0.5 D
B 2 D
C 1 D
D -1.5 D

Answer: -0.5 D
25 The image formed by a convex mirror of a real object is larger than the object
A when u < 2f
B when u > 2f
C for all values of u
D for no value of u

Answer: for no value of u
26 The mirror used for the head light of a car is
A spherical concave
B plane
C cylindrical
D parabolic concave

Answer: parabolic concave
27 The radius of curvature of a plane mirror
A is zero
B is infinity
C can be anywhere between zero and infinity
D None of the above

Answer: is infinity
28 An object is placed at the focus of a concave mirror. The image will be
A real, inverted, same size at the focus
B real, upright, same size at the focus
C virtual, inverted, highly enlarged at infinity
D real, inverted, highly enlarged at infinity

Answer: real, inverted, highly enlarged at infinity
29 An optician prescribes a power = - 0.5 dioptre. The corresponding lens must be a
A convex lens of focal length 2 m
B convex lens of focal length 50 cm
C concave lens of focal length 2 m
D concave lens of focal length 50 cm

Answer: concave lens of focal length 2 m
30 What kind of image is created by a concave lens?
A upright and smaller
B inverted and smaller
C inverted and larger
D upright and smaller

Answer: upright and smaller
31 What kind of lens is used by short-sighted persons?
A convex
B concave
C cylindrical
D None of the above

Answer: concave
32 An object is kept 5 cm in front of a concave mirror of focal length of 15 cm. What will be the nature of the image?
A virtual, not magnified
B virtual, magnified
C real, magnified
D real not magnified

Answer: virtual, magnified
33 What type of mirror is used in a view finding mirror of a vehicle?
A Convex mirror
B Concave mirror
C Plane mirror
D Paraboloidal mirror

Answer: Convex mirror
34 A number of images of a candle flame can be seen in a thick mirror. The brightest image is -
A last
B fourth
C third
D second

Answer: second
35 An object is placed at a distance of 12 cm from a convex lens on its principal axis and a virtual image of certain size is formed. If the object is moved further 8 cm away from the lens, a real image of the same size as that of the virtual image is formed . Which one of the following is the focal length of the lens?
A 15 cm
B 16 cm
C 18 cm
D None of the above

Answer: 16 cm
36 Different objects at different distances are seen by the eye. The parameter that remains constant is
A the focal length of the eye lens
B the object distance from the eye lens
C the radii of culvature of the eye lens
D the image distance from the eye lens

Answer: the image distance from the eye lens
37 According to the theory of relativity, which of the following always remains constant?
A Length of an object
B Time
C Space
D Velocity of light

Answer: Velocity of light
38 A colour blind person cannot
A see distant objects
B see black colour
C distinguished between certain colours
D None of the above

Answer: distinguished between certain colours
39 A rear-view mirror for driving is
A plain
B concave
C convex
D inverted

Answer: convex
40 In a laser (say neon laser) all the atoms emit the light waves of
A same frequency
B same amplitude
C same phase
D All of the above

Answer: All of the above

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