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The angular width of the central maximum...

The angular width of the central maximum in a single slit diffraction pattern is `60^@`. The width of the slit is 1 `mu`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.)

A

(A) `75 mu m`

B

(B) `100 mu m`

C

(C) `25 mu m`

D

(D) `50 mu m`

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