Wave Optics-Wavefront (NEET Physics): Questions 1 - 5 of 6

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Question number: 1

» Wave Optics » Wavefront

Assertion-Reason▾

Assertion (Ꭺ)

The cloud in sky generally appears to be whitish.

Reason (Ꭱ)

Diffraction due to clouds is efficient in equal measure at all wavelengths.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false

Question number: 2

» 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: 3

» Wave Optics » Wavefront

MCQ▾

Question

When a mica sheet (µ = 1.6) of thickness 7 microns is placed in the path of one of interfering beams in the biprism experiment then the central fringe gets shifted at the position of seventh bright fringe. The wavelength of light used will be –

Choices

Choice (4) Response

a.

6000 Å

b.

7000 Å

c.

4000Å

d.

5000 Å

Question number: 4

» Wave Optics » Wavefront

MCQ▾

Question

Red light of wavelength 6500 Å from a distant source falls on a slit 0.5 mm wide. What is the distance between two dark bands on each side of central bright band of diffraction pattern observed on a screen placed 1.8 m from the slit?

Choices

Choice (4) Response

a.

4.68 ×10 -3 mm

b.

4.68 × 10 -3 nm

c.

4.68 × 10 -3 cm

d.

4.68 × 10 -3 m

Question number: 5

» Wave Optics » Wavefront

MCQ▾

Question

In the given diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on θ for constructive interference at P between the ray BP and reflected ray OP

Wavefront diagram with CP as wavefront

Wavefront Diagram With CP as Wavefront

In the given diagram, CP represents a wavefront and AO & BP, the corresponding two rays.

Choices

Choice (4) Response

a.

secθcosθ=λd

b.

secθcosλ=4λd

c.

cosθ=3λ2d

d.

cosθ=λ4d

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