A prism (mu = 1.5) has the refracting an...

A prism `(mu = 1.5)` has the refracting angle of `30^(@)` . The deviation of a monochromatic ray incident normally on its one surface will be `[sin 48^(@)36' = 075]`

`18^@36'`

`20^@30'`

`18^@`

`22^@1'`

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