Q.

A mixture of plane polarised and unpolarised light falls normally on a polarising sheet. On rotating the polarising sheet about the direction of the incident beam, the transmitted intensity varies by a factor 4. Find the ratio of the intensities IP and I0 respectively of the polarised and unpolarised components in the incident beam.

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answer is 1.5.

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Detailed Solution

Imn=I0/2 Imax=I02+Ip

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A mixture of plane polarised and unpolarised light falls normally on a polarising sheet. On rotating the polarising sheet about the direction of the incident beam, the transmitted intensity varies by a factor 4. Find the ratio of the intensities IP and I0 respectively of the polarised and unpolarised components in the incident beam.