Figure represents a glass plate placed vertically on a horizontal table with a beam of unpolarised light falling on its surface at the polarising angle of `57^@` with the normal. The electric vector in the reflected light on screen S will vibrate with respect to the plane of incidence in a

Options

A. (a) Vertical plane
B. (b) Horizontal plane
C. (c) Plane making an angle of `45^@` with the vertical
D. (d) Plane making an angle of `57^@` with the horizontal

Answer

A

Explanation

When unpolarised light is made incident at polarising angle, the reflected light is plane polarised in a direction perpendicular to the plane of incidence.
Therefore `vecE` in reflected light will vibrate in vertical plane with respect to plane of incidence.