Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 24 - 27 of 64

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Question number: 24

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

Light of wavelength 6328 Å is incident normally on slit having a width of 0.2 mm. The width of the central maximum measured from minimum to minimum of diffraction pattern on a screen 9.0 meters away will be about –

Choices

Choice (4) Response

a.

0.36°

b.

0.09°

c.

0.18°

d.

0.72°

Question number: 25

» Wave Optics » Brewster's Law

MCQ▾

Question

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.

16.9°

b.

46.9°

c.

26.9°

d.

36.9°

Question number: 26

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

In an experiment similar to Young’s experiment, interference is observed using waves associated with electrons. The electrons are being produced in an electron gun. In order to decrease the fringe width,

(1) Electron gun voltage be increased.

(2) The slits be moved away from each other

(3) The screen be moved closer to interfering slits.

(4) Electron gun voltage be decreased.

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

Question number: 27

» Wave Optics » Brewster's Law

MCQ▾

Question

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.

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