Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 19 - 23 of 64

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Question number: 19

» Wave Optics » Wavefront

MCQ▾

Question

When a wave of wavelength 0.2 cm is made incident normally on a slit of width 0.004m, then the semi-angular width of central maximum of diffraction pattern will be

Choices

Choice (4) Response

a.

b.

30°

c.

60°

d.

90°

Question number: 20

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

In Young’s double slit experiment, white light is used. The separation between the slits is b. The screen is at a distance d (d > > b) from the slits. Some wavelengths are missing exactly in front of one slit. One of these wavelengths is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 21

» Wave Optics » Huygens' Principle

MCQ▾

Question

In an interference pattern, at a point we observe the 16 th order maximum for λ 1= 6000A. What order will be visible here if the source is replaced by light of wavelength? λ 2 = 4800 Å

Choices

Choice (4) Response

a.

40

b.

20

c.

80

d.

10

Question number: 22

» Wave Optics » Polarization

MCQ▾

Question

Two Polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of 30 0 with each other. What fraction of incident unpolarised light is transmitted?

Choices

Choice (4) Response

a.

37.5 %

b.

27.5 %

c.

57.5 %

d.

17.5 %

Question number: 23

» Wave Optics » Polarization

MCQ▾

Question

Out of the following statements which are correct?

(1) Nicol prism works on the principle of double refraction and total internal reflection

(2) Nicol prism can be used to produce and analyses polarised light

(3) Calcite and Quartz are both doubly refracting crystals

(4) When unpolarised light passes through a Nicol prism, the emergent light is elliptically polarized

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

Codes:

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1,2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

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