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

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## Question number: 37

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

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

### Choices

Choice (4) Response

a.

b.

c.

d.