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In a YDSE if a slab whose refractive ind...

In a YDSE if a slab whose refractive index can be varied is palced in fron of one of the slits then the variation of resultant intensity of mid-point of screen with `mu` will be represented by (assume slits of equal width and there is no absorption by slab)

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`mu= 1 implies triangle x=0" "I=` maximum
`triangle x= (mu-1)t" "mu uparrow implies triangle x` increases from 0 to `(lambda)/(2)" to "lambda`
Intensity first decreases then increases.
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