First slide

Polarisation

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

Moderate

A

Vertical plane
B

Horizontal plane
C

Plane making an angle of 45⁰ with the vertical
D

Plane making an angle of 57⁰ with the horizontal

Solution

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 $\vec{E}$ in reflected light will vibrate in vertical plane with respect to plane of incidence.

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