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In ideal double-slit experiment, a glass...

In ideal double-slit experiment, a glass plate (refractive index = 1.5) of thickness `t` is introduced in the path of one of the interfering beams (wavelength `lambda`), intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass plate is

A

`2lambda`

B

`2lambda//3`

C

`lambda//3`

D

`lambda`.

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