The relation between the fringe width for the red light and yellow light is: (all other things being the same.)

1. βred<βyellow
2. βred>βyellow
3. βred=βyellow
4. βred=2βyellow

Subtopic:  Young's Double Slit Experiment |
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Fringe width in a particular YDSE is measured to be β. What will be the fringe width if the wavelength of the light is doubled, the separation between the slits is halved and the separation between the screen and slits is tripled?

1. 10 times

2. 11 times

3. Same

4. 12 times

Subtopic:  Young's Double Slit Experiment |
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If the 5th order maxima of wavelength 4000 Ao in Young's double-slit experiment coincides with the nth order maxima of wavelength 5000 Ao, then n is equal to:

1.  5

2.  8

3.  4

4.  10

Subtopic:  Young's Double Slit Experiment |
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Two coherent sources are 0.3 mm apart. They are 1 m away from the screen. The second dark fringe is at a distance of 0.3 cm from the center. The distance of the fourth bright fringe from the centre is:

1.  0.6 cm

2.  0.8 cm

3.  1.2 cm

4.  0.12 cm

Subtopic:  Young's Double Slit Experiment |
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In Young's double-slit experiment the light emitted from the source has λ = 6.5 × 10–7 m and the distance between the two slits is 1 mm. The distance between the screen and slits is 1 metre. Distance between third dark and fifth bright fringe will be:


1. 3.2 mm 

2. 1.63 mm 

3. 0.585 mm 

4. 2.31 mm

Subtopic:  Young's Double Slit Experiment |
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In Young's double slit experiment, the angular width of fringe is 0.20o for sodium light of wavelength 5890 Å.  The angular width of fringe, if the complete system is dipped in water, will be:

1. 0.11o

2. 0.15o

3. 0.22o

4. 0.30o

Subtopic:  Young's Double Slit Experiment |
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In Young's double-slit experiment, the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to:

1. 1.8 mm

2. 1.9 mm

3. 2.1 mm

4. 1.7 mm

Subtopic:  Young's Double Slit Experiment |
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NEET - 2018
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Two slits in Young's experiment have widths in the ratio of 1: 25. The ratio of intensity at the maxima and minima in the interference pattern Imax/Imin is:
1. 9/4
2. 121/49
3. 49/121
4. 4/9

Subtopic:  Young's Double Slit Experiment |
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NEET - 2015
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In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be:

1. 0.2 mm

2. 0.3 mm

3. 0.4 mm

4. 1.2 mm

Subtopic:  Young's Double Slit Experiment |
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In YDSF the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the first dark fringe and the fourth bright fringe is obtained to be 0.6 cm. The wavelength of the light used in the experiment is:

1. 3.4×10-7 m
2. 4.1×10-7 m
3. 3.4×10-9 m
4. 4.1×10-9 m

Subtopic:  Young's Double Slit Experiment |
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