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Question
A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. What is the distance between the first dark fringe on either side of the central bright fringe?
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Solution
`beta = (lambda"D")/"d"`
d = 1 mm
λ = 600 × 10-9 m
D = 2m
`= (6 xx 10^2 xx 10-9 xx 2)/(1 xx 10^-3)`
= 1.2 mm
Distance between two dark fringes which are on either side of the central bright fringe = 2 × 1.2 mm = 2.4 mm
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