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State clearly how an unpolarised light gets linearly polarised when passed through a polaroid. Unpolarised light intensity I_(0) is incidentP_(1) which is kept near another polaroid P_(2) whose pass axis is parallel to that of P_(1).How will the intensities of light, I_(1) and I_(2) , transmitted by the polarids P_(1) and P_(2) respectively, change on rotating P_(1)[ without disturbing P_(2) ? |
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Answer» Solution :The light having vibrations of electric field vector in all possible DIRECTIONS perpendicular to the direction of WAVE progation is called ordinarylight. The light having vibrations field VECTORS in only ONE direaction perpendicular tothe directionof progation of light is called plane polarised light. (i) N/A (II) The value of the sound intensity inversely squared with increasing distance from sound source, i.e with ` 1/r^(2)` ` I alpha 1/(r^(2)) = I_(2)/I_(1) = r_(1)^(2)/r_(1)^(2) Rightarrow I_(2) =I_(1) (r_(1)/r_(2))^(2)` |
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