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A ray of light travelling in water is in...

A ray of light travelling in water is incident on a glass plate immersed in it. When the angle of incident is `51^(@)` the reflected ray is totally plane polarized. Find the refractive index of glass. Refractive index of water is 1.33.

Text Solution

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Angle of incidence `=theta_(p)=51^(@)`
51° Since at this incidence angle, reflected ray is totally plane polarized, using Brewster.s law, refractive index of glass w.r.t. water is,
`n.=tantheta_(p)=tan51^(@)=1.235`
But `n.=("refractive index of glass "(n_(g)))/("refractive index of water "(n_(g)))`
`:.n_(g)=n.n_(w)=1.235xx1.33=1.64`
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