# Ray Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 67 - 71 of 105

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## Question number: 67

» Ray Optics » Power of a Lens

MCQ▾

### Question

A convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 68

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

MCQ▾

### Question

Two plane mirrors are inclined to each other at some angle. A ray of light incident at 30° on one, after reflection from the other retraces its path. The angle between the mirrors is

### Choices

Choice (4) Response

a.

45°

b.

60°

c.

90°

d.

30°

## Question number: 69

» Ray Optics » Power of a Lens

MCQ▾

### Question

A convex lens when placed in the first position forms a real image of an object on a fixed screen. The distance between the object and the screen is 75 cm. On displacing the lens from first position by 25 cm to the second position again a real image is formed on the screen. Then the focal length of the lens is

### Choices

Choice (4) Response

a.

16.7 cm

b.

25.0 cm

c.

33.3 cm

d.

50.3 cm

## Question number: 70

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

MCQ▾

### Question

A prism having an apex angle 4° and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror?

### Choices

Choice (4) Response

a.

176°

b.

c.

178°

d.

## Question number: 71

» Ray Optics » Mirror Formula

MCQ▾

### Question

A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror. Find the approximate size of the image.

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above