CUET · PHYSICS · PYQ PAPER 2023
Polaroids A and B are placed with their axes perpendicular to each other. Unpolarised light of intensity \(I_0\) is incident on A. A third polaroid C is kept between A and B such that its axis makes an angle of \(30^\circ\) with that of B. The Intensity of transmitted light through B is:
- A \(\frac{ I _0}{8}\)
- B \(\frac{I_0}{32}\)
- C \(\frac{3 I _0}{32}\)
- D \(\frac{9 I _0}{32}\)
Answer & Solution
Correct Answer
(C) \(\frac{3 I _0}{32}\)
Step-by-step Solution
Detailed explanation
\(I_A = \frac{I_0}{2}\) \(I_C = I_A \cos^2(60^\circ) = \frac{I_0}{2} \left(\frac{1}{2}\right)^2 = \frac{I_0}{8}\) \(I_B = I_C \cos^2(30^\circ) = \frac{I_0}{8} \left(\frac{\sqrt{3}}{2}\right)^2 = \frac{I_0}{8} \cdot \frac{3}{4} = \frac{3I_0}{32}\)
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