# Ray Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 77 - 81 of 105

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## Question number: 77

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

MCQ▾

### Question

A ray of light fall normally on a refracting face of a prism of refractive index 1.5. Find the angle of the prism if the ray just fails to emerge from the prism.

### Choices

Choice (4) Response

a.

55°

b.

22°

c.

12°

d.

42°

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## Question number: 78

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

MCQ▾

### Question

Which of the following form (s) a virtual and erect image for all positions of the object?

(1) Convex lens (2) Concave lens

(3) Convex mirror (4) Concave mirror

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 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

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## Question number: 79

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

MCQ▾

### Question

Two thin lenses of focal length 60 & -20 cm in contact have a resultant focal length of,

### Choices

Choice (4) Response

a.

-15 cm

b.

+30 cm

c.

+15 cm

d.

-30 cm

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## Question number: 80

MCQ▾

### Question

A glass plate 4 mm thick is viewed from the above through a microscope. The microscope must be lowered 2.58 mm as the operator shifts from viewing the top surface to viewing the bottom surface through the glass. What is the index of refraction of the glass?

### Choices

Choice (4) Response

a.

1.61

b.

3.24

c.

1.55

d.

1.21

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## Question number: 81

» Ray Optics » Power of a Lens

MCQ▾

### Question

A slide projector lens has a focal length 10 cm. It throws an image of a 2cm × 2cm slide on a screen 5 m from the lens. Find the size of the picture on the screen

### Choices

Choice (4) Response

a.

(78 × 78) cm 2

b.

(64 × 64) cm 2

c.

(88 × 88) cm 2

d.

(98 × 98) cm 2

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