Задача 40791.

Natural light passes through two Nicol, which transmission plane and form an angle of 45 °. To determine how many times the intensity I decreases light emerging from the analyzer, compared to the intensity I0 of the light incident on the polarizer when the light transmittance in each Nicol prism is 0.9.

Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.