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In Young's experiement the width of the ...

In Young's experiement the width of the fringes obtained with light of wavelength `6000Å` is `2mm`. Calculate the fringe width if the entire apparatus is immersed in a liquid of refractive index `1.33`.
Data : `lambda=6000Å=6xx10^(-7)m`, `beta=2mm=2xx10^(-3)m mu=1.33`, `beta=?`

Text Solution

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`beta=(Dlambda.)/(d)=(lambdaD)/(mud)=(beta)/(mu)` `[:.mu=(lambda)/(lambda.)]`
`:.beta.=(2xx10^(-3))/(1.33)=1.5xx10^(-3)m` (or) `1.5mm`.
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