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Consider a light beam incident from air to a glass slab at Brewster's angle as shown in figure.
A polaroid is placed in the path of the emergent ray at point $\mathrm{P}$ and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.
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A polaroid is placed in the path of the emergent ray at point $\mathrm{P}$ and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.
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The intensity of light as seen through the polaroid shall go through a minimum but not zero for two orientations of the polaroid
The intensity of light as seen through the polaroid shall go through a minimum but not zero for two orientations of the polaroid
Let us consider the diagram shown below the light beam incident from air to the glass slab at Brewster's angle $\left(i_p\right)$. The angle between reflected ray $B E$ and $B C$ is $90^{\circ}$.
Then only reflected ray is plane polarised represented by arrows.
As the emergent and incident ray are unpolarised, so, polaroid rotated in the way of CD then the intensity cannot be zero but varies in one complete rotation.
Then only reflected ray is plane polarised represented by arrows.
As the emergent and incident ray are unpolarised, so, polaroid rotated in the way of CD then the intensity cannot be zero but varies in one complete rotation.
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