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  • An unpolarised light beam of intensity is passed through a polaroid <img alt="\math

An unpolarised light beam of intensity 2 \mathrm{I}_{0} is passed through a polaroid \mathrm{P} and then through another polaroid \mathrm{Q} which is oriented in such a way that its passing axis makes an angle of 30^{\circ} relative to that of \mathrm{P}. The intensity of the emergent light is
 

Option: 1

\frac{\mathrm{I}_{0}}{4}


Option: 2

\frac{\mathrm{I}_{0}}{2}


Option: 3

\frac{3 \mathrm{I}_{0}}{4}


Option: 4

\frac{3 \mathrm{I}_{0}}{2}


Answers (1)

best_answer

By Malus Law,

\mathrm{I=I_{o}\cos ^{2}\Theta }

    \mathrm{=I_{o}\left (\cos 30\degree \right )^{2} }

  \mathrm{I=\frac{3I_{o}}{4}}

Hence 3 is correct option

Posted by

Shailly goel

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