MHT CET 2025 Physics question
Two polaroids are placed in the path of unpolarised beam of intensity 'I' such that no light is emitted from the second polaroid. If a third polaroid whose polarisation axis makes an angle '' with the polarisation axis of first polaroid is placed between these polaroids then the intensity of light emerging from the last polaroid will be
Answer: (B)
Solution
No light from the second polaroid means the first and second polaroids are crossed (axes at ). Unpolarised light of intensity through the first polaroid gives . Through the third polaroid (angle to the first) by Malus's law: . The last polaroid's
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