Suppose that you held two polarizing sheets in front of you and looked through b

Question

Suppose that you held two polarizing sheets in front of you and looked through both of them. How many times would you see the sheets lighten and darken:

a. if one of them were rotated through one complete rotation?

b. if both of them were rotated through one complete rotation at the same rate in opposite directions?

c. if both of them were rotated through one complete rotation at the same rate in the same direction?

d. if one sheet rotates twice as fast as the other but in opposite directions and the slow sheet makes one complete rotation?

The answer for a is 2. I can't figure out how to get the other answers, please help.

Explanation / Answer

(a) 2 times

(b)

if both of them were rotated through one complete rotation at the same rate in opposite directions four times would you see the sheets lighten and darken: ( two times for each sheet)

(c)if both of them were rotated through one complete rotation at the same rate in the same direction we would not see any light and darken

(d)

six times

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