Question: When light falls on a balanced detector (i.e., a detector pair, with one detector output subtracted from the other's output), the output current is proportional

When light falls on a balanced detector (i.e., a detector pair, with one detector output subtracted from the other's output), the output current is proportional to the difference of the intensities incident on the two detectors. Find the probability density function of the difference of the instantaneous intensities of two independent polarized thermal light beams with equal average intensities.

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