Set- 3 Light-Reflection and Refraction

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Set- 3 Light-Reflection and Refraction

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MCQ test contains multiple choice questions with only one answer.

There is a total of 10 questions.

This is a 5 min test. Please make sure you complete it in the stipulated time.

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A concave lens can form a real and inverted image, when

2 points

(a) object is placed away from 2f

(b) object is placed at 2f

(d) it can never form real and inverted image

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The focal length of a convex lens is 20 cm, its power is

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(a) + 20 D

(b) - 20 D

(d) - 5 D

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The focal length of a plane mirror is

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(a) 1 m

(b) zero

(d) 50 cm

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Which statement is correct about a concave mirror

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(a) for it value of ‘ v’ is always negative

(b) for it value of ‘ u’ is always positive

(d) its focal length is positive

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The velocity of light in vacuum is

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(a) 8 × 10^3 ms-1

(b) 3 × 10^6 ms-1

(d) 6 × 10^3 ms-1

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sin i /sin r was stated by

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(a) Archimedes

(b) Snell

(d) C.V. Raman

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Value of refractive index does not depend on

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(a) angle of incidence

(b) substance of medium

(d) all the above

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Bottom of a tank containing water appears to be raised due to

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(a) reflection

(b) diffraction

(d) all the above

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For a normal incidence the value of angle of reflection is

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(a) 60 degree

(b) 90 degree

(d) 0 degree

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If value of n21 is 1.25, value of n12 will be

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(a) 0.625

(b) 0.4

(d) 1.0

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