# Ray Optics-Snell's Law (NEET (National Eligibility cum Medical Entrance Test) 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 respectively. The angle of incidence θ for which the beam just misses entering Region IV is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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.

b.

c.

30 0

d.

## 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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