A thin prism of glass is placed in air a...

A thin prism of glass is placed in air and water respectively. If `n_(0) = (3)/(2)` and `n_(w) = (4)/(3)`, then the ratio of deviation produced by the prism for a small angle of incidence when placed in air and water separately is:

`(1)/(2)`

`(1)/(4)`

`(1)/(5)`

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