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  • A beam of unpolarised light of intensity I0  is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes and angle of 45

A beam of unpolarised light of intensity I0  is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes and angle of 450 relative to that of A. The intensity of the emergent light is :

 

Option: 1

I0 / 8


Option: 2

I0


Option: 3

I0 / 2


Option: 4

I0 / 4


Answers (1)

best_answer

When the beam of unpolarized light passed through a polaroid A, then its intensity becomes \frac{I_{o}}{2}

I_{A}=\frac{I_{o}}{2}

When this again passed through a polaroid B, oriented at 45^{\circ} relative to A then,

I_{B}=I_{A}\cdot Cos^{2}45^{\circ}

=I_{A}\cdot \left ( \frac{1}{2} \right )7

I_{B}=\frac{I_{A}}{2}=\frac{I_{o}}{4}

Posted by

Gautam harsolia

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