The refractive index of a prism is 2. this prism can have a maximum refracting angle of

Options

A. `90^(@)`
B. `60^(@)`
C. `45^(@)`
D. `30^(@)`

Answer

b.

Explanation

Critical angle `theta_(c)=sin^(-1)((1)/(mu))`
`=sin^(-1)((1)/(2))=30^(@)`
If `A gt 2theta_(c)` , the ray does not emerge from the prism. So, maximum angle can be `60^(@)` .