Lenses & Mirrors General Knowledge Quiz | Lenses & Mirrors General Knowledge Multiple Choice Questions(MCQs) & Answers

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Questions
1 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
2 The human eye is like a camera and hence it contains a system of lens. The eye lens forms
A a straight or upright, real image of the object on the retina
B an inverted, virtual image of the object on the retina
C an inverted, real image of the object on the retina
D a straight or upright, real image of the object on the iris

Answer: an inverted, real image of the object on the retina
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3 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
4 The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for
A a microscope
B a telescope
C both microscope and telescope
D neither microscope nor telescope

Answer: a telescope
5 The mirror used for the head light of a car is
A spherical concave
B plane
C cylindrical
D parabolic concave

Answer: parabolic concave
6 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
7 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
8 Which one among the following is used to make periscope?
A Concave lens
B Concave mirror
C Plane mirror
D None of the above

Answer: Plane mirror
9 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-diverging lens
D plano-converging lens

Answer: diverging lens
10 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 4 m
B 0.30 m
C twice your height
D half of your height

Answer: half of your height
11 What would be the number of images formed of an object in two mirrors placed at right angles to each other?
A two
B three
C four
D six

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

Answer: second
13 What type of mirror is used in a view finding mirror of a vehicle?
A Concave mirror
B Convex mirror
C Plane mirror
D Paraboloidal mirror

Answer: Convex mirror
14 The head mirror used by E.N.T doctors is -
A Plane
B Convex
C Concave
D Plano-convex

Answer: Concave
15 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
16 What kind of lens is used by short-sighted persons?
A convex
B concave
C cylindrical
D compound

Answer: concave
17 How far must an object be from a concave mirror if the image formed is to be inverted?
A less than its focal length
B exactly at its focal length
C more than its focal length
D None of the above

Answer: more than its focal length
18 How far must a girl stand in front of a concave spherical mirror of radius 120 cm to see an erect image of her face four times its natural size?
A 40 cm from the mirror
B 45 cm from the mirror
C 50 cm from the mirror
D 55 cm from the mirror

Answer: 45 cm from the mirror
19 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
20 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

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