Question

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^o with the normal. The electric vector in the reflected light on screen S will vibrate with respect to the plane of incidence in a

[CPMT 1988]

• A. Vertical plane
• B. Horizontal plane
• C. Plane making an angle of 45^o with the vertical
• D. Plane making an angle of 57^o with the horizontal

Answer 1

The correct option is A

Vertical plane

When unpolarized light is made to incident at the polarising angle, the reflected light is plane polarised in a direction perpendicular to the plane of incidence.

Therefore the electric field in reflected light will vibrate in vertical plane with respect to plane of incidence.