# Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 47 - 51 of 64

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

## Question number: 47

» Wave Optics » Young's Double Slit Experiment

Assertion-Reason▾

### Assertion (Ꭺ)

In Young’s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper.

### Reason (Ꭱ)

The cellophane paper decreases the wavelength of light.

### Choices

Choice (4) Response

a.

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

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

## Question number: 48

» Wave Optics » Polarization

MCQ▾

### Question

When an unpolarised light of intensity I 0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

### Choices

Choice (4) Response

a.

Zero.

b.

c.

d.

## Question number: 49

» Wave Optics » Interference

MCQ▾

### Question

Two coherent sources of intensity ratio 1: 4 produce an interference pattern. The fringe visibility will be –

### Choices

Choice (4) Response

a.

1

b.

0.6

c.

0.4

d.

0.8

## Question number: 50

MCQ▾

### Question

In Fresnel’s biprism experiment the width of 10 fringes is 2cm which are formed at a distance of 2 meter from the slit. If the wavelength of light is 5100 Å then the distance between two coherent sources will be,

### Choices

Choice (4) Response

a.

5.1 ×10 -4 mm

b.

5.1 ×10 -4 m

c.

5.1 ×10 -4 cm

d.

10.1 ×10 -4 cm

## Question number: 51

MCQ▾

### Question

Fraunhoffer diffraction pattern is observed at a distance of 2m on screen, when a plane-wavefront of 6000A is incident perpendicularly on 0.2 mm wide slit. Width of central maxima is:

### Choices

Choice (4) Response

a.

12 mm

b.

6 mm

c.

10 mm

d.

None of the above