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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`]

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