A ray of light is incident on the surface of a glass plate of R.I 1.55, at the polarising angle of incidence. Calculate the angle of refractions.

Explanation

`mu=1.55 tan i_B=1.5500`
`i_n=57^@ 10'`
`therefore sinr=(sini_B)/(mu)=(sin 57^@10')/(1.55)=(0.8403)/(1.55)`
`sin r=0.5421`
`therefore r=32^@ 50`