Describe how plane polarized light can be produced by double refraction

Describe how plane polarized light can be produced by double refraction

• A narrow beam of monochromatic light is made incident on nicol prism and viewed from the opposite side as shown above
• The angle of incidence is gradually increased or changed and at each angle, the polaroid is rotated about an axis through its plane.
• At one point, the emergent light completely cut off through the polaroid and at this point light is completely   plane polarized.

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