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A ray of light travelling in impure wate...

A ray of light travelling in impure water is incident on a glass plate immersed in it. Wher the angle of incidence is `51^(@)`, the reflected ray i totally plane polarised. Given that refractiv index of impure water is 1.4. The refractive index of glass should be ......

A

`1.64`

B

`1.34`

C

1.53

D

1.73

Text Solution

Verified by Experts

The correct Answer is:
D
`theta_(i) + theta_(r)= (pi)/(2)`
Applying snell.s law
`mu_("water")Sintheta_(l)= mu_("glass")sintheta_(r)= mu_("glass")costheta_(r)`
`implies mu_("glass")= 1.4 xx tan50^(@)= 1.4 xx 1.235 ~~ 1.73`
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