Light MCQ question and answer with solution

31

The number of images of an object placed between two parallel mirrors is

A) Two B) One C) Six D) Infinite

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Answer & Solution

Answer: Option D

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32

Daltonism (Protanopia) is the form of colour blindness in which the patient cannot see

A) green colour B) red colour C) blue colour D) All of these

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Answer & Solution

Answer: Option D

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33

A ray of light goes from water to glass. Its-

A) speed increases towards normal B) speed increases and away from the normal C) slow down a towards the normal D) slow down and away from normal

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Answer & Solution

Answer: Option C

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34

Assertion (A): In the visible spectrum of light, red light is more energetic than green light.
Reason (R): The wavelength of red light is more than that of green light.

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option D

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35

A periscope works on the principle of

A) refraction B) total internal reflection C) diffraction D) reflection

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Answer & Solution

Answer: Option D

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36

The lens-type commonly used for correcting presbyopia is . . . . . . . .

A) bifocal lens B) cylindrical lens C) convex lens D) concave lens

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Answer & Solution

Answer: Option A

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37

What will be the focal length of a spherical mirror with radius of curvature R?

A) $$\frac{R}{2}$$ B) 2r C) 3R D) R

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Answer & Solution

Answer: Option A

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38

Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?

A) The cloth completely absorbs red colour wavelength B) It is due to refraction C) It is the effect of scattering of light D) It is due to parallax error

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Answer & Solution

Answer: Option A

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39

Dentists use a concave mirror because the image built on it is . . . . . . . .

A) real and large B) virtual but foggy C) real but invertered D) virtual and large

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Answer & Solution

Answer: Option D

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40

Diffusion of light in the atmosphere takes place due to

A) Carbon dioxide B) Dust particles C) Helium D) Water vapours

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Answer & Solution

Answer: Option B

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Light MCQ question and answer with solution | Physics Gk MCQs