What happens when two polarizers are placed in a straight line, one behind the other? o a. they allow light to pass only if they are polarized in exactly the same direction. ob. they block all light if they are polarized in exactly the same direction. o c. they allow light to pass only if their directions of polarizations are exactly 90° apart. od. they block all light if their directions of polarizations are exactly 90° apart. o e. they block all light if their directions of polarizations are either exactly the same or e>