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When the mica sheet of thickness 7micros...

When the mica sheet of thickness `7`micros and `mu=1.6` is placed in the path of one of interfering beams in the biprism experiment then the central fringe gets at the position of seventh bright fringe.The wavelength of light used will be

A

`4000Å`

B

`5000Å`

C

`6000Å`

D

`7000Å`

Text Solution

Verified by Experts

The correct Answer is:
3
`lambda=((mu-1))/(n)....(1)`
Accoding to question
`n=7,mu=1.6,t=7xx10^(-6)meter...(2)`
From eqs (1) and(2)
`lambda=6xx10^(-7)`meter
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