When sunlight is incident on water surface at glacing angle of `37^(@)`, the reflected light is found to be completely plane-polarised. Determine (a) the refractive index of water and (b) angle of refraction.

Explanation

(a) `mu=tanp=tan 53^(@)=4//3`
(b) `i+r=90^(@)implies p+r=90^(@)implies53+r=90`
`r=37^(@)`