AP EAMCET · PHYSICS · Wave Optics
Two polaroids are placed in the path of unpolarised light beam of intensity \(I_0\) such that no light is emitted from the second polaroid. If a third polaroid whose polarisation axis makes an angle \(\theta\) with that of the first polaroid is placed between the polaroids, then intensity of light emerging from the last polaroid is
- A \(\left(\frac{I_0}{8}\right) \sin ^2 2 \theta\)
- B \(\left(\frac{I_0}{4}\right) \sin ^2 2 \theta\)
- C \(\left(\frac{I_0}{2}\right) \cos ^2 \theta\)
- D \(I_0 \cos ^2 \theta\)
Answer & Solution
Correct Answer
(A) \(\left(\frac{I_0}{8}\right) \sin ^2 2 \theta\)
Step-by-step Solution
Detailed explanation
When unpolarised light passes through first polariser, it becomes polarised and its intensity becomes half. \(\therefore\) After first polariser, intensity \(I_1=I_0 / 2\) After second polariser, intensity \(I_2=\frac{I_0}{2} \cos ^2 \theta\) (Malus law) After third polariser,…
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