Polarized light is to have its polarization plane rotated by 90
degrees. In which of the following cases does the final beam have
the greatest intensity?
Select one:
a. 1 polarizing filter, rotating the beam by 90 degrees
b. 3 polarizing filters, both rotate the beam by 30 degrees
c. 6 polarizing filters, each rotating the beam by 15
degrees
d. None of the above, polarized light can't be rotated
please explain the answer think it is C.