(D) The intensity of light transmitted through a polaroid is given by Malus' Law: $I = I_0 \cos^2 \theta$,where $\theta$ is the angle between the plan

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The intensity of light is twice maximum and twice zero.

(D) The intensity of light transmitted through a polaroid is given by Malus' Law: $I = I_0 \cos^2 \theta$,where $\theta$ is the angle between the plane of polarization of the incident light and the transmission axis of the polaroid.As the polaroid is rotated by $2\pi$ $(360^\circ)$,the angle $\theta$ varies from $0$ to $2\pi$.- The intensity $I$ becomes maximum $(I = I_0)$ when $\theta = 0$ and $\theta = \pi$ (twice).- The intensity $I$ becomes zero when $\theta = \pi/2$ and $\theta = 3\pi/2$ (twice).Therefore,during one complete rotation,the intensity of light becomes maximum twice and zero twice.

Class 12 Physics Wave Optics Polarisation of Light and Malus' Law

Medium

Plane polarised light is passed through a polaroid. On viewing through the polaroid,we find that when the polaroid is given one complete rotation about the direction of the light,one of the following is observed:

A
The intensity of light gradually decreases to zero and remains at zero.
B
The intensity of light gradually increases to a maximum and remains at maximum.
C
There is no change in intensity.
D
The intensity of light is twice maximum and twice zero.