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Question

Monochromatic green light of wavelength 5 ×107 m illuminates a pair of slits 1 mm apart. The separation of bright lines in the interference pattern formed on a screen 2 m away is :

A
0.25 mm
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B
0.1 mm
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C
1.0 mm
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D
0.01 mm
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Solution

The correct option is C 1.0 mm
Given,

λ=5×107m

d=1mm=0.001m

D=2m

The separation between two bright fringe is called fringe width.

B=Dλd

B=2×5×107103

B=1mm

The correct option is C.

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