A ray of light enters in air from glass. What wi be deviation angle if angle of incidence is `50^@` Take refractive index of glass 1.5.

Options

A. `0^@`
B. `80^@`
C. `50^@-sin^(-1)((sin50^@)/(1.5))`
D. `sin^(-1)(1.5 sin50^@)-50^@`

Answer

A, D

Explanation

According to Snell.s law,
`1.5sin 50^@=(1)sinr`
`therefore r=sin^(-1)(1.5sin50^@)`
Now,`delta=r-50^@`
`delta=sin^(-1)(1.5sin50^@)`