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A plate of thickness t made of a material of refractive index `mu` is placed in front of one of the slits in a double slit experiment. (a) Find the changes in the optical path due to introduction of the plate. (b) What should be the minimum thickness t which will make the intensity at the center of the fringe pattern zero ? Wavelength of the light used is `lamda`. Neglect any absorption of light in the plate.

A

`(mu-1)t, lambda/(2(mu-1))`

B

`2(mu-1)t,(lambda)/(mu-1)`

C

`(mu-1)t,lambda/(mu-1)`

D

`(mu-1)t/2,lambda/(mu-1)`

Text Solution

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The correct Answer is:
A
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