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 
with the normal. The electric vector in the reflected light on screen S will vibrate with respect to the plane of incidence in a
- Vertical plane
- Horizontal plane
- Plane making an angle of
with the vertical
- Plane making an angle of with the horizontal
with the vertical
with the horizontal
The correct answer is: Vertical plane
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 
in reflected light will vibrate in vertical plane with respect to plane of incidence.
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