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(A) According to Brewster's Law,when unpolarised light is incident on a transparent surface at the polarising angle,the reflected light is completely

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Vertical plane

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(A) According to Brewster's Law,when unpolarised light is incident on a transparent surface at the polarising angle,the reflected light is completely plane-polarised.The electric field vector of this reflected light vibrates in a direction perpendicular to the plane of incidence.In the given figure,the glass plate is placed vertically on a horizontal table. The plane of incidence is the plane containing the incident ray and the normal to the surface. Since the light is incident at an angle with the normal on a vertical surface,the plane of incidence is horizontal.Therefore,the electric vector of the reflected light,being perpendicular to the horizontal plane of incidence,will vibrate in a vertical plane.

The figure shows a glass plate placed vertically on a horizontal table. $A$ beam of unpolarised light falls on its surface at the polarising angle of $57^\circ$ with the normal. The electric vector in the reflected light on screen $S$ will vibrate with respect to the plane of incidence in a:

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