1.

A ray of light propagates from glass (refractive index =(3)/(2)) to water (refractive index =(4)/(3)). The value of the critical angel is

Answer»

`sin^(-1)((1)/(2))`
`sin^(-1)(sqrt((8)/(9)))`
`sin^(-1)((8)/(9))`
`sin^(-1)((3)/(4))`

Solution :Since `n_(g)=(3)/(2) and n_(W)=(4)/(3)`, hence `n_(GW)=(3//2)/(4//3)=(9)/(8) therefore sin i_(c)=(1)/(n_(gw))=(8)/(9) or i_(c)=sin^(-1)((8)/(9))`


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