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Write the special causes of law of malus...

Write the special causes of law of malus.

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Special cases
(i) When `theta=0`, then `"cos"theta="cos"0=1,I=I_(0)`. Intensity of incident light does not change.
(ii) When `theta=pi/(2),"cos"pi/(2)=0thereforeI=0`. Hence intensity of incident plane polarised light becomes zero.
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