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Question

In Young's experiment, the fringe width was found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3, the new fringe width in mm is

A
0.25
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B
0.30
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C
0.40
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D
0.53
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Solution

The correct option is A 0.30
The fringe width in water is
βw=βanw
nw= refractive index of water =4/3
βw=0.44/3mm=0.3 mm.

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