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Light is incident at an angle i on a gl...

Light is incident at an angle `i` on a glass slab. The reflected ray is completely polarished . The angle of refraction is

A

`90^(@)-i`

B

`180^(@)-i`

C

`90^(@)+i`

D

i

Text Solution

Verified by Experts

The correct Answer is:
A
Brewster discovered that when a beam of unpolarised light is reflected from a transparent medium (refractive index = `mu`), the reflected light is completely plane polarised at a certain angle of incidence (called the angle of polarisation i).

From figure it is clear that `i_(p)+r=90^(@)`
and" "`r=(90^(@)-i_(p))=90-i`
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