Two coherent plane waves of equal amplitude make a small angle alpha ( very very less than 1 ) with each other . They fall almost normally on a screen . If lambda is the wavelength of light waves , the fringe width delta x of interference patterns of the two sets of waves on the screen is a) lamda/alpha  b) lamda/2*alpha   c) 2* lambda / alpha  d)lamda / root alpha . No links

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The correct answer is b i.e.


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