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In a Young's double slit experiment, sli...

In a Young's double slit experiment, slits are seperated by a distance d and screen is at distance D, `(D gt gt d)` from slit plane. If light source of wavelength `lambda(lambda ltlt d)` is used. The minimum distance from central point on the screen where intensity is one fourth of the maximum is `(D lambda)/(nd)`. Find the value of n.

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