An unpolarized light beam travelling in air is incident on a medium...

An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then -

Options

Areflected light is completely polarized and the angle of reflection is close to $60^{\circ}$
Breflected light is partially polarized and the angle of reflection is close to $30^{\circ}$
Cboth reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to $60^{\circ}$ and $30^{\circ}$ , respectively
Dtransmitted light is completely polarized with angle of refraction close to $30^{\circ}$

Correct answer

A. reflected light is completely polarized and the angle of reflection is close to $60^{\circ}$

Step-by-step solution

When unpolarised light is incident on a medium of refractive index 1.73 at Brewster's angle then reflected light is completely polarised. Using Brewster's Law

\begin{aligned} & \mu=\tan \left(i_p\right) \\ & 1.73=\tan \left(i_p\right) \\ & i_p=60^{\circ} \end{aligned}

By Law of reflection,

i_p=r=60^{\circ}

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