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In YDSE shown in figure a parallel beam ...

In YDSE shown in figure a parallel beam of light is incident on the slits from a medium of refractive index `n_(1)`. The wavelength of light in this medium is `lambda_(1)`. A transparent slab of thickness t and refractive index `n_(3)` is put in front of one slit. The medium between the screen and the plane of the slits is `n_(2)`. The phase difference between the light waves reaching point O (symmetrical, relative to the slits) is

A

`(2pi)/(n_1lambda_1)(n_3-n_2)t`

B

`(2pi)/(lambda_1)(n_3-n_2)t`

C

`(2pin_1)/(n_2lambda_1)((n_3)/(n_2)-1)t`

D

`(2pin_1)/(lambda_1)(n_3-n_1)t`

Text Solution

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The correct Answer is:
A
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