1.

A hollow equilateral air prism is immersed in water. Calculate the deviation of a ray incident at an angle 30^(@) from the base side (.^(a)mu_(w)=(4)/(3))

Answer»

`8.5^(@)`
`12.5^(@)`
`16.5^(@)`
`20.2^(@)`

Solution :(C ) `(sin30^(@))/(sinr)=(mu_(2))/(mu_(1))or(4)/(3)sin30^(@)=1xxsinr`
`therefore r = 41.8^(@)`
Ray is incident on the adjacent FACE at `18.2^(@)` from the rafracting EDGE.

`1.sin18.2=(4)/(3)sine"" [therefore(mu_(a))/(mu_(w))=(sine)/(sin182)]`
`therefore e = 13.5^(@)`
`D = (41.8^(@) - 30) + (18.2^(@) - 13.5^(@))`


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