NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 995 - 998 of 2320

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Question number: 995

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

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MCQ▾

Question

Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be

Choices

Choice (4)Response

a.

1.8 x 10 8 m/s

b.

13.6 x 10 6 m/s

c.

1.8 x 10 2 m/s

d.

3.6 x 10 8 m/s

Question number: 996

» Ray Optics » Snell's Law

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The focal length of a lens is different for all colors of light

Reason (Ꭱ)

The focal length depends only upon the material of the lens.

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 false

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 997

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

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MCQ▾

Question

A prism of dispersive power 0.021 and refractive index 1.53 form an achromatic combination with prism of angle 4.2° and dispersive power 0.045 having refractive index 1.65. Find the resultant deviation.

Choices

Choice (4)Response

a.

4.18°

b.

3.12°

c.

2.16°

d.

1.12°

Question number: 998

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

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MCQ▾

Question

Two plane mirrors are inclined at an angle θ. A ray of light is incident on one mirror at an angle of incidence i. The ray is reflected from this mirror, falls on the second mirror from where it is reflected parallel to the first mirror. What is the value of i, the angle of incidence in terms θ?

Choices

Choice (4)Response

a.

θ - 90°

b.

2θ - 90°

c.

4θ - 90°

d.

3θ - 90°

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