Ray Optics (NEET Physics): Questions 34 - 38 of 102

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Question number: 34

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

MCQ▾

Question

What is the refractive index of material of a Plano-convex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm?

Choices

Choice (4) Response

a.

13

b.

43

c.

23

d.

14

Question number: 35

» Ray Optics » Magnification

MCQ▾

Question

The relation between the linear magnification m, the object distance u and the focal length f for a spherical mirror is

Choices

Choice (4) Response

a.

m=ffu

b.

m=f+uf

c.

m=fuf

d.

m=ff+u

Question number: 36

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

Assertion-Reason▾

Assertion (Ꭺ)

The sun looks bigger at sunrise and sunset than at noon

Reason (Ꭱ)

The atmosphere of the earth, due to its density gradient, acts as a lens.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 37

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

MCQ▾

Question

The light gathering power of a camera lens doesn’t depend on

(1) Ratio of focal length and diameter

(2) Product of focal length and diameter

(3) Wavelength of light used

(4) Its diameter

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.

2 and 4 are correc

d.

1 and 3 are correct

Question number: 38

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

MCQ▾

Question

A convex lens of focal length 10.0 cm is placed in contact with a convex lens of 15.0 cm focal length. What is the focal length of the combination?

Choices

Choice (4) Response

a.

4 cm

b.

12 cm

c.

8 cm

d.

6 cm

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