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A thin sheet of glass (refractive index 1.5) of thickness 6 microns, introduced in the path of one of the interfering beams in a double-slit experiment shift the central fringe to a position earlier occupied by the fifth bright fringe. The wavelength of light used is

A

7

B

4

C

8

D

6

Text Solution

Verified by Experts

The correct Answer is:
A
`(mu-1)t= 7lambda`
`implies t= (7 xx 600 xx 10^(-9))/(1.6-1) = 7 xx 10^(-6)mimplies t= 7 mum`
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