Q.

In Young's double slit experiment the distance between two sources is 0.1 mm. The distance of the screen from the source is 20 cm. Wave length of light used is 5460A°. The angular position of the first dark fringe is nearly

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a

0.08°

b

0.20°

c

0.32°

d

0.16°

answer is D.

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Detailed Solution

dsinθ=(2n1)λ2;sinθθ=(2n1)λ2dradθ=[2(1)1]5460×101020.1×103×180π=0.159=0.16

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