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

Options

A. `90^(@) - i`
B. `180^(@) - i`
C. `90^(@) + i`
D. `i`

Answer

A

Explanation

Brester 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 + r = 90^(@)`
`r = (90 - i)`