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Question

Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when bluegreen light of wavelength 500 nm is used?

A
0.5 mm
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B
5 mm
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C
50 mm
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D
0.5 m
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Solution

The correct option is A 0.5 mm
Given,
d=1 mm=103 m
D=1 m
λ=500 nm=5×107m
Therefore, fringe seperation is given by
β=λDd=5×107×1103=0.5 mm

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