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 change in the optical path due to introduction of the plate. (b) What should be the maximum thickness t which will make the intensity at the centre of the fringe pattern zero ? Wavelength of the light used is lambda. Neglect any absorption of light in the plate.

A plate of thickness t made of a material of refractive index mu is pl

1.	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 change in the optical path due to introduction of the plate. (b) What should be the maximum thickness t which will make the intensity at the centre of the fringe pattern zero ? Wavelength of the light used is lambda. Neglect any absorption of light in the plate.
Answer» `(MU - 1)t, (LAMBDA)/(2(mu-1))` `2(mu - 1)t, (lambda)/(mu-1)` `(mu - 1)t, (lambda)/(mu-1)` `(mu - 1)(t)/(2), (lambda)/(mu-1)` ANSWER :A

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