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Intensity of light after polarizing filter

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Completely polarized light is passed through a polarizing sheet.
The light that passes though has an intensity of 50% of the incident beam. The angle between the direction of the polarization of the incident beam and the direction of the polarization of the sheet must be what?

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Let us denote this angle B.
Then, if we take the X-axis along the polarization axis of the polarizing sheet and Y-axis in the plane of the polarizing sheet and perpendicular to the X-axis, the electric ...

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