Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 37 - 41 of 64

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Question number: 37

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

MCQ▾

Question

The first diffraction minima due to a single slit diffraction is at θ = 30° for a light of wavelength 5000 Å. The width of the slit is-

Choices

Choice (4) Response

a.

1.0 × 10 -5 cm

b.

1.25 × 10 -5 cm

c.

2.5 × 10 -5 cm

d.

5 × 10 -5 cm

Question number: 38

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

MCQ▾

Question

A diffraction pattern is produced by a single slit of width 0.5mm with the help of a convex lens of focal length 40cm. If the wavelength of light used is 5896A. Then the distance of first dark fringe from the axis will be

Choices

Choice (4) Response

a.

0.047 mm

b.

0.047 m

c.

47 cm

d.

0.047 cm

Question number: 39

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

In Young’s double slit experiment, carried out with light of wavelength λ = 5000 Å, the distance between the slits is 0.2 mm and the screen is at 200 cm from the slits, The central maximum is at x = 0. The third maximum will be at

Choices

Choice (4) Response

a.

1.5 cm

b.

5.0 cm

c.

1.67 cm

d.

0.5 cm

Question number: 40

» Wave Optics » Polarization

MCQ▾

Question

V 0 and V E represent the velocities, µ 0 and μ E the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then

Choices

Choice (4) Response

a.

if the crystal is calcite

b.

if the crystal is quartz

c.

if the crystal is quartz

d.

if the crystal is calcite

Question number: 41

» 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.

b.

c.

d.

f Page