In a Young's double slit experiment with...

In a Young's double slit experiment with light of wavelength `lamda` the separation of slits is d and distance of screen is D such that `D gt gt d gt gt lamda`. If the fringe width is `beta`, the distance from point of maximum intensity to the point where intensity falls to half of maximum intensity on either side is

`beta/4`

`beta/3`

`beta/2`

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