In Young’s double-slit experiment the fringe width is β. If entire arrangement is placed in a liquid of refractive index n, the fringe width becomes 

(1) βn+1

(2)

(3) βn

(4) βn1

Subtopic:  Young's Double Slit Experiment |
 85%
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In Young’s double slit experiment, distance between two sources is 0.1 mm. The distance of screen from the sources is 20 cm. Wavelength of light used is 5460 Å. Then angular position of the first dark fringe is 

1. 0.08°

2. 0.16°

3. 0.20°

4. 0.32°

Subtopic:  Young's Double Slit Experiment |
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In a Young’s double slit experiment, the slit separation is 0.2 cm, the distance between the screen and slit is 1m. Wavelength of the light used is 5000 Å. The distance between two consecutive dark fringes (in mm) is 

(1) 0.25

(2) 0.26

(3) 0.27

(4) 0.28

Subtopic:  Young's Double Slit Experiment |
 86%
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A star emitting light of wavelength 5896 Å is moving away from the earth with a speed of 3600 km/sec. The wavelength of light observed on earth will 

(1) Decrease by 5825.25 Å

(2) Increase by 5966.75 Å

(3) Decrease by 70.75 Å

(4) Increase by 70.75 Å

(c = 3 × 108 m/sec is the speed of light)

Subtopic:  Superposition Principle |
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A heavenly body is receding away from the earth such that the fractional change in λ is 1, then its velocity is :

(1) C

(2) 3C5

(3) C5

(4) 2C5

Subtopic:  Superposition Principle |
 70%
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What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000Å is used and slit width is 12×10–5 cm 

(1) 2 rad

(2) 3 rad

(3) 1 rad

(4) 8 rad

Subtopic:  Diffraction |
 73%
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The direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by:
(a is the width of the slit) 

1. asinθ=λ2

2. acosθ=3λ2

3. asinθ=λ

4. asinθ=3λ2

Subtopic:  Diffraction |
 71%
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A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the edges of the slit is:
1. \(0\)
2. \(\pi\over 2 \)
3. \(\pi\)
4. \(2\pi\)

Subtopic:  Diffraction |
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A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to:

1. 0o

2. 15o

3. 30o

4. 60o

Subtopic:  Diffraction |
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In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the wavelength λ1 is found to be coincident with the third maximum at λ2. So

(1) 3λ1=0.3λ2

(2) 3λ1=λ2

(3) λ1=3.5λ2

(4) 0.3λ1=3λ2

Subtopic:  Diffraction |
 79%
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