Wave Optics-Brewster's Law (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 5 of 5

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Question number: 1

» Wave Optics » Brewster's Law

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Question

When light of a certain wavelength is incident on a plane surface of a material at a glancing angle 30°, the reflected light is found to be completely plane polarized. Determine refractive index of given material –

Choices

Choice (4) Response

a.

b.

2

c.

d.

Question number: 2

» Wave Optics » Brewster's Law

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A light has amplitude A and angle between analyser and polariser is 60°. Light transmitted by analyser has amplitude

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 3

» Wave Optics » Brewster's Law

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Image of sun formed due to reflection at air water interface is found to be very highly polarized. Refractive index of water being , find the angle of sun above the horizon.

Choices

Choice (4) Response

a.

46.9°

b.

36.9°

c.

26.9°

d.

16.9°

Question number: 4

» Wave Optics » Brewster's Law

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A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster’s angle Φ. If μ represents the refractive index of glass with respect to air, then the angle between reflected and refracted rays is,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 5

» Wave Optics » Brewster's Law

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Question

Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in Fig. A polaroid is placed in the path of the emergent ray at point Pand rotated about an axis passing through the center and perpendicular to the plane of the polaroid.

light beam incident from air to a glass

Light Beam Incident from Air to a Glass

light beam incident from air to a glass

Choices

Choice (4) Response

a.

The intensity of light as seen through the Polaroid shall be independent of the rotation.

b.

For a particular orientation there shall be darkness as observed through the polaoid.

c.

The intensity of light as seen through the Polaroid shall go through a minimum for four orientations of the Polaroid.

d.

The intensity of light as seen through the Polaroid shall go through a minimum but not zero for two orientations of the Polaroid.

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