# Ray Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 47 - 50 of 105

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## Question number: 47

» Ray Optics » Lens Maker's Formula and Lens Formula

MCQ▾

### Question

A convex lens is made out of a substance of 1.2 refractive index. The two surfaces of lens are convex. If this lens is placed in water whose refractive index is 1.33 it will behave as:

### Choices

Choice (4) Response

a.

Plane glass plate

b.

like a prism

c.

Convergent lens

d.

divergent lens

## Question number: 48

» Ray Optics » Reflection and Refraction of Light » Smooth Surface

Assertion-Reason▾

### Assertion (Ꭺ)

Convex mirror is preferred to a plane mirror, in vehicles, to observe traffic coming from behind.

### Reason (Ꭱ)

A convex mirror provides wider field of view, then a plane mirror of the same size.

### 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: 49

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

Dispersive power does not depend upon

(1) The shape of prism

(2) Angle of prism

(3) Height of the prism

(4) Material of prism

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

Codes:

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1,2 and 3 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

## Question number: 50

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

The refractive index of the material of a prism is and its prism angle is 30°. One of its refracting faces is polished. The incident beam of light will return back for the angle of incidence

### Choices

Choice (4) Response

a.

45°

b.

c.

30°

d.

60°