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Question

Two parallel slits 0.6 mm apart are illuminated by light source of wavelength 6000oA. The distance between two consecutive dark fringes on a screen 1 m away from the slits is

A
1 mm
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B
0.01 mm
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C
0.1 mm
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D
10 m
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Solution

The correct option is A 1 mm
Distance between two consecutive Dark fringes
β=λDd

=6000×1010×10.6×103

=1×103m=1 mm

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