Ray Optics (NEET Physics): Questions 67 - 71 of 102

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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.

34D

b.

43D

c.

1D

d.

7D

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?

A prism and vertical plan mirror

A Prism and Vertical Plan Mirror

A prism having an apex angle 40 and refractive index 1.5 is located in front of a vertical plan mirror shown in figure.

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(fuf)2

b.

b(fu+f)2

c.

b(2fuf)2

d.

All of the above

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