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In the ideal double-slit experiment, whe...

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

A

`2lamda`

B

`(2lamda)/3`

C

`lamda/3`

D

`lamda`

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A
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