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Wave Optics

JEE Main level, single correct, medium

189 of 191

Question 189 of 191

Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either polaroid must be turned if the intensity is to drop by one-half is

Show answer and solution

Answer: (A) $135^{\circ}$

For

I=\frac{I_0}{2}

and

I=I_0 \cos ^2 \theta=\frac{I_0}{2}

\therefore \theta=45^{\circ}

Therefore the angle through which either polaroids turned is

135^{\circ}\left(=180^{\circ}-45^{\circ}\right)

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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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.