Задача 40965.

How many times will the intensity of a circularly polarized beam of light passing through two polarizers decrease, the angle between the planes of which is 60 °, if a quartz plate is inserted between them, which turns the plane of polarization of light through an angle of 30 °?

A detailed solution with a brief record of the conditions, formulas and laws used in the decision, the conclusion of the calculation formula and the answer.
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