Ray Optics-Snell's Law (NEET Physics): Questions 1 - 4 of 8

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Question number: 1

» Ray Optics » Snell's Law

MCQ▾

Question

A light beam is travelling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are no,n02,n06andn08 respectively. The angle of incidence θ for which the beam just misses entering Region IV is,

Beam Travelling from Region I to Region IV

Beam Travelling From Region I to Region IV

In figure beam is travelling from region I to region IV. n0, n02, n06 andn08 are the refractive indexes of region I, II, III and IV respectively.

Choices

Choice (4) Response
a.

sin1(34)

b.

sin1(18)

c.

sin1(13)

d.

sin1(14)

Question number: 2

» Ray Optics » Snell's Law

Assertion-Reason▾

Assertion (Ꭺ)

The focal length of a lens is different for all colors of light

Reason (Ꭱ)

The focal length depends only upon the material of the lens.

Choices

Choice (4) Response
a. Ꭺ is true but Ꭱ is false
b. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
c. Ꭺ is false but Ꭱ is true
d. Both Ꭺ and Ꭱ are false

Question number: 3

» Ray Optics » Snell's Law

MCQ▾

Question

A ray of light is incident on a transparent glass-slab of refractive index 1.5. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

Choices

Choice (4) Response
a.

tan132

b.

sin123

c.

30 0

d.

tan123

Question number: 4

» Ray Optics » Snell's Law

MCQ▾

Question

Light from a sodium lamp (λ 0 = 589 nm) passes through a tank of glycerin (refractive index 1.47) 20 m long in a time t 1. If it takes a time to traverse the same tank when filled with carbon disulphide (index 1.63), then the difference t 2 - t 1 is,

Choices

Choice (4) Response
a.

6.67 × 10 -8 sec

b.

2.07 × 10 -7 sec

c.

1.09 × 10 -7 sec

d.

1.07 × 10 -8 sec

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