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Wave Optics

JEE Main level, single correct, medium

166 of 191

Question 166 of 191

A beam of unpolarised light of intensity ${I}_{0}$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so that its principal plane makes an angle of $45^{\circ}$ relative to that of $A$ . The intensity of emergent light is :

Show answer and solution

Answer: (A) $\dfrac{{I}_{0}}{4}$

Intensity of polarised light from polaroid

A

will be

\dfrac{{I}_{0}}{2}

. Therefore,
Intensity of emergent light

=\dfrac{{I}_{0}}{2}{\cos }^{2}45^{\circ}=\dfrac{{I}_{0}}{4}

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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More Physics practice

JEE Main Physics practice question on Wave Optics (Polarization of Light), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

A beam of unpolarised light of intensity I0{I}_{0}I0​ is passed through a polaroid AAA and then through another polaroid BBB which is oriented so that its principal plane makes an angle of 45∘45^{\circ}45∘ relative to that of AAA. The intensity of emergent light is :

JEE Main question paper PDF

More Physics practice

A beam of unpolarised light of intensity ${I}_{0}$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so that its principal plane makes an angle of $45^{\circ}$ relative to that of $A$ . The intensity of emergent light is :