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A thin glass prism (n= 1.5) is immersed ...

A thin glass prism `(n= 1.5)` is immersed in water `(n= 1.3)`. If the angle of deviation in air for a particular ray be `D`, then that in water will be :

A

`0.2 D`

B

`0.3 D`

C

`0.5 D`

D

`0.6 D`.

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