A double slit experiment is performed with light of wavelength `500nm`. A thin film of thickness `2mum` and refractive index `1.5` is introduced in the path of the upper beam. The location of the central maximum willA. (a) Remain unshiftedB. (b) shift downward by nearly two fringesC. (c) shift upward by nearly two fringesD. (d) shift downward by 10 fringes

A double slit experiment is performed with light of wavelength `500nm`

1.	A double slit experiment is performed with light of wavelength `500nm`. A thin film of thickness `2mum` and refractive index `1.5` is introduced in the path of the upper beam. The location of the central maximum willA. (a) Remain unshiftedB. (b) shift downward by nearly two fringesC. (c) shift upward by nearly two fringesD. (d) shift downward by 10 fringes
Answer» Correct Answer - C If shift is equal to n fringes width, then `n=((mu-1)t)/(lambda)=((1.5-1)xx2xx10^-6)/(500xx10^-9)` `=(1)/(500)xx10^3=2` Since a thin film is introduced in upper beam. So shift will be upward.

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