Ray of light moving in water incidents on glass plate. Reflected light becomes completely plane polarised when incident at `51^(@)`, so refractive index of glass will be ...... [Refractive index of water `1.3 and tan 51^(@)=1.235]`

Options

A. `1.33`
B. `1.805`
C. `1.605`
D. `1.305`

Answer

C

Explanation

`(n_(g))/(n_(omega))= tan theta_(p)`
`:.n_(g)=n_(omega)tan51^(@)`
`=1.3xx1.235=1.6055~~1.605`