The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 μ m. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young's fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance?
(i.e. distance between the centres of each slit.)
Text Solution
Verified by ExpertsThe correct answer is:
C
Sol.
Semi-angular width = 30°
asin θ = λ
asin30° = λ
Fringe width 
= 
⇒ 
⇒ d = 
= 25 μ m
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