Ray Optics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 42 - 46 of 105

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Question number: 42

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

MCQ▾

Question

A thin prism of angle A = 6° produces a deviation δ = 3°. Find the refractive index of the material of prism.

Choices

Choice (4) Response

a.

0.5

b.

1.0

c.

1.5

d.

2.5

Question number: 43

» Ray Optics » Power of a Lens

MCQ▾

Question

The power of a Plano-convex lens is P. If this lens is cut longitudinally along its principal axis into two equal parts and then they are joined as given in the figure. The power of combination will be

Figure is Plano- convex lens

Figure Is Plano- Convex Lens

The Plano-convex lens is cut longitudinally along its principal axis into two equal parts and then they are joined as shown in figure.

Choices

Choice (4) Response

a.

P

b.

2P

c.

Equation

d.

Zero

Question number: 44

» Ray Optics » Mirror Formula

MCQ▾

Question

The radius of a glass ball is 5 cm. There is an air bubble at l cm from the center of the ball and refractive index of glass is 1.5. The position of image viewed from surface near the bubble is.

Choices

Choice (4) Response

a.

4.63 cm

b.

5.12 cm

c.

3.63 cm

d.

2.12 cm

Question number: 45

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

Assertion-Reason▾

Assertion (Ꭺ)

The size of the mirror doesn’t affect the nature of the image.

Reason (Ꭱ)

Small mirror always forms a virtual image.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 46

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

Assertion-Reason▾

Assertion (Ꭺ)

A double convex lens Equation has focal length 10 cm. When the lens is immersed in water Equation its focal length becomes 40 cm.

Reason (Ꭱ)

Equation

Choices

Choice (4) Response

a.

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

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

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