BITSAT 2019 Physics Optics Revision Quiz 1

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Question 1

In Fraunhoffer diffraction experiment, L is the distance between screen and the obstacle, b is the size of obstacle and is wavelength of incident light. The general condition for the applicability of Fraunhoffer diffraction is

• A
• B
• C
• D

Question 2

If unpolarized light falls on a glass plate at an incidence angle of 57⁰, the reflected light is

• Aunpolarized
• Bcompletely polarized with dot vibrations
• CCompletely polarized with dash vibrations
• Dpartially polarized with 15% dot and 85% dash vibrations

Question 3

In the dispersion of white light form a prism, the violet light is deviated more than the red light because

• Athe velocity of violet rays of light is more.
• Bthe wavelength of violet rays of light is more.
• Cthe frequency of violet rays of light is more.
• Dthe refractive index of prism for violet rays of light is more.

Question 4

The resolving power of telescope depends on

• Afocal length of eye lens
• Bfocal length of objective lens
• Clength of the telescope
• Ddiameter of the objective lens

Question 5

The refracting angle of a prism is A and the refractive index is cot . The angle of minimum deviation is

• A180⁰-A
• B180⁰-2A
• C180⁰-3A
• D180⁰-4A

Question 6

A ray of light is incident on an equilateral glass prism placed on a horizontal table. For minimum deviation, which of the following is true?

• AQR is horizontal
• BPQ is horizontal
• CEither PQ or QS is horizontal
• DRS is horizontal

Question 7

If eyeis kept at a depth h inside the water of refractive index and viewed outside, then the diameter of circle through which the outer objects become visible, will be

• A
• B
• C
• D

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