Two polaroids are placed in the path of unpolarised beam of intensity  such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle  with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be a) b) c) d)

Question ID - 150052 :- Two polaroids are placed in the path of unpolarised beam of intensity  such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle  with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be a) b) c) d)

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(a)

No light is emitted from the second polaroid, so  and  are perpendicular to each other

Let the initial intensity of light is . So Intensity of light after transmission from first polaroid

Intensity of light emitted from

Intensity of light transmitted from last polaroid  from

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 Two beams of light of intensity  interfere to give an interference pattern. If the ratio of maximum intensity to that of minimum intensity is then  is a) 5/3 b) 4 c) d) 16