Two polarizers are arranged as shown. how much light will reach point x?

C) 50%

Step-by-step explanation:

If the polarizes are parallel, then it will be 0%. But if they're both perpendicular than it will be 50%. If they are neither parallel nor perpendicular, than it will be less than 50% and greater than 0%

0

Step-by-step explanation:

The light intensity would be cut by 100% if the second filter is rotated 90 degrees.

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.