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Light is incident at an angle $i$ on a glass slab. The reflected ray is completely polarised. The angle of refraction is
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Verified Answer
The correct answer is:
$90^{\circ}-i$
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 $i+r=90^{\circ}$
$$
r=(90-i)
$$
From figure it is clear that $i+r=90^{\circ}$
$$
r=(90-i)
$$
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