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(a) Distinguish betweenunpolarized light and linearly polarizedlight. How does one getlinearly polarisedlight with thehelp of a plaroid ? (b) A narrowbeam of unpolarised light of intensityI_(0) is incidenton a polaroid P_(1).The light transmittedby it is then incidentona secondpolaroidP_(2) withits pass axismakingangleof 60^(@)relative to the pass axis of P_(1). Find the intensityof the lighttransmittedby P_(2). |
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Answer» Solution :Distinction between unpolarised and linearly polarized light obtainigng linearly polarized Light 1 In an unpolarised th eoscillations, of the electric field, arc in random directions, in planes perpendicular to the direction of propagation. For a polarized light, the oscillations are aligned along one particular direction. Alternatively. Polarized light can be DISTINGUISHED, form unpolarised light when it is allowed to pass through a POLAROID. Polaroid light does can sho CHANGE in its intensity remains same in CASE of unpolarised light. When unpolarised light WAVE is incident on a polaroid, then the electric vectors along teh direction of its aligned molecules, get absorbed , the electric vector, oscillation alogn a direction perpendicular to thealigned molecules, pass thorugh. This light is called linearly polarized light. |
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