# Ray Optics-Snell's Law (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 5 - 7 of 8

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## Question number: 5

» Ray Optics » Snell's Law

MCQ▾

### Question

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is . A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 6

» Ray Optics » Snell's Law

MCQ▾

### Question

A ray of monochromatic light is incident on the plane surface of separation between two media x and y with angle of incidence i in the medium x and angle of refraction r in the medium y. The graph shows the relation between sin i and sin r.

(1) The speed of light in the medium y is times than in medium x

(2) The speed of light in the medium y is times than in medium x.

(3) The total internal reflection can take place when the incidence is in x.

(4) The total internal reflection can take place when the incidence is in y

Select the correct answers and mark it according to the following codes:

Codes:

### Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

## Question number: 7

» Ray Optics » Snell's Law

MCQ▾

### Question

A ray of light incident on a prism surface at an angle of 50° in the minimum deviation position. If the angle of prism is 60° then the values of δ m and µ will be respectively- (sin 50° = 0.766)

### Choices

Choice (4) Response

a.

60° and 1.532

b.

0° and 1.532

c.

40° and 1.532

d.

90° and 1.532

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