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A monochromatic light of lambda = 5000 o...

A monochromatic light of `lambda` = 5000 `overset (@)(A)` is incident on two slits separated by a distance of 5 xx 10^-4 m . If a thin glass of thickness 1.5 x 10^-6 m and refractive index 1.5 placed between one of the slits and screen . The phase difference introduced at the position of central maxima is

A

`3 pi`

B

`2 pi`

C

`pi/2`

D

`pi/3`

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