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In Fresnel's biprism experiment the widt...

In Fresnel's biprism experiment the width of `10`fringes is `2cm`which are formed at a distance of two`2meter` from the silt .If the wavelength of light is `5100Å`then the distance between two coherent sources will be

A

`5.1xx10^(-4)m`

B

`5.1xx10^(4)cm`

C

`5.1xx10^(-4)mm`

D

`10.1xx10^(-4)cm`

Text Solution

Verified by Experts

`d=(Dlambda)/(beta)…(1)`
According to question
`lambda=5100xx10^(-10)m`
`beta=(2)/(10)xx10^(-2)m….(2)`
`D=2m,d=?`
From eqs.(1) and(2)
`d=(2xx51xx10^(-8))/(2xx10^(-3))=5.1xx10^(-4)m`
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