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In an ideal YDSE when a glass plate (mu=...

In an ideal YDSE when a glass plate (`mu`=1.5) of thickness t is introduced in the path of one of the interfering beams the intensity at the position where the central maximum occured previously remains unchanged. The maximum thickness of the glass plate is:

A

`lambda`

B

`lambda//3`

C

`(2lambda)/3`

D

`2lambda`

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