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In a Young's double slit experimental ar...

In a Young's double slit experimental arrangement shown here, if a mica sheet of thickness t and refractive indec `mu` is placed in front of the slit `S_1`, then the path difference `(S_1P-S_2P)` is

A

Decreases by `(mu-1)t`

B

Increases by `(mu-1)t`

C

Does not change

D

Increases by `mu t`

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The correct Answer is:
B
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