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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`

Text Solution

Verified by Experts

The correct Answer is:
A
Path difference`=(mu-1)t=nlimda`,
For minimum `t, n=1`, :'`t=2limda`
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