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(a) Distinguish between unpolarised light and linearly polarised light. How does one get linearly polarised light with the hel of a polaroid ? (b) A narrow beam of unpolarised light of intensity I_(0) is incident on a polaroid P_(1). The light transmitted by it is then incident on a second polaroid P_(2) with its pass axis making angle of 60^(@) relative to the pass axis of P_(1). find the intensity of the light transmitted by P_(2). |
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Answer» Solution :(b) When a narrow beam of unpolarised light of INTENSITY `I_(0)` is incident on a polarised `P_(1)`, the transmitted light is plane polarised light whose intensity is `I_(1)=(I_(0))/(2)`. When the plane polarised light is incident on a SECOND polaroid `P_(2)` with its PASS axis making an ANGLE of `theta=60^(@)` relative to the pass axis of `P_(1)`, then intensity `I_(2)` of emergent light from `P_(2)` is `I_(2)=I_(1)cos^(2)theta=((I_(0))/(2))xx(cos60^(@))^(2)=(I_(0))/(2)xx((1)/(2))^(2)=(I_(0))/(8)`. |
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