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A parallel beam of monochromatic light o...

A parallel beam of monochromatic light of wacelength `lambda` used in a Young's double slit experiment. The siits are separated by a distance `d` and the screen is placed parallel to the plane of the slits. The incident beam makes an angle `theta=sin^(-1)((lambda)/(2d))` with the normal to the slits. `A` transparent sheet of refractive index `'mu'` and thickness `t=(lambda)/(2(mu-1))` is introduced infront of one of the slit. find the intensity at the geometrical centre.

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