JEE Main | 2018Wave OpticsHard
Question
The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 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.)
Options
A.
50 m
B.
75 m
C.
100
D.
25m
Solution
In diffraction
d sin 30º =
Young's fringe width
[d' – separation between two slits]
10-2 =
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