# Wave Optics-Diffraction Due to a Single Slit Width of Central Maximum (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 10 - 15 of 17

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## Question number: 10

» 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: 11

» 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

## Passage

Angular width of central maximum in the Fraunhoffer-diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000 Å. When, the slit is illuminated by light of another wavelength, the angular width decreases by 30%.

## Question number: 12 (1 of 2 Based on Passage) Show Passage

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

MCQ▾

### Question

The same decrease in the angular width of central maximum is obtained when the original apparatus is immersed in a liquid. Find refractive index of the liquid.

### Choices

Choice (4) Response

a.

1.23

b.

1.43

c.

2.43

d.

2.2

## Question number: 13 (2 of 2 Based on Passage) Show Passage

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

MCQ▾

### Question

The wavelength of the light is

### Choices

Choice (4) Response

a.

5200 Å

b.

5000 Å

c.

4200 Å

d.

3500 Å

## Question number: 14

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

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: 15

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

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

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