Monochromatic green light of wavelength 5 ×10−7 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=5×10−7m
d=1mm=0.001m
D=2m
The separation between two bright fringe is called fringe width.