A plane of thickness t madeof a materialof refractiveindex mu ispalced is frontof one of the slits ina doubleslitexperiment(a) . Findthe changein the optical path dueto introduction of the plate (b) Whatshouldbe the minimumthickness t whichmakethe intensityat the centre of the fringe patternzero ? Wavelength of the light used is lambda.Neglect any absorption of light in the palne .

A plane of thickness t madeof a materialof refractiveindex mu ispalced

1.	A plane of thickness t madeof a materialof refractiveindex mu ispalced is frontof one of the slits ina doubleslitexperiment(a) . Findthe changein the optical path dueto introduction of the plate (b) Whatshouldbe the minimumthickness t whichmakethe intensityat the centre of the fringe patternzero ? Wavelength of the light used is lambda.Neglect any absorption of light in the palne .
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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