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A beam of light is incident on a system ...

A beam of light is incident on a system as shown in the figure. Behind the prism there is a plane parallel plate, with the space between filled up with benzene (R.I = n'). Find the deviation in the emergent beam w.r.t incident beam in terms of `alpha,n,n'`. Assume `alpha` = small angle [Take both cases `n gt n' & n' gt n`]

Text Solution

Verified by Experts

The correct Answer is:
`[(n-n')alpha]`
As net deviation `= delta_(1) -delta_(2)+delta_(2)`
`= delta_(1)-(delta_(f)-r)+(e-r)`
`=e =nr =n' delta_(1)`
`:. delta_("rel")=(n-n')alpha`
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