A 10-mW vertically polarized laser beam passes through a polarizing filter whose axis is 30 degrees from the horizontal followed by another polarizing filter with its axis horizontal.What is the power in the laser beam that emerges from the polarizer?

Question

Quizplus · Accepted Answer

The power after the first filter is 10 mW * cos²(60°) = 2.5 mW. After the second filter, it is 2.5 mW * cos²(30°) = 1.9 mW.

A 10-MW Vertically Polarized Laser Beam Passes Through a Polarizing