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)

75`mu`m

100`mu`m

25`mu`m

50`mu`m

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