A pair of crossed Polaroids will transmit light
A)of sufficiently long wavelengths.
B)that itself is polarized.
C)if a third Polaroid at about 45 degrees is inserted between the two.

Question

Quizplus · Accepted Answer

When a third polaroid is inserted between two crossed polaroids at an angle of about 45 degrees, it partially aligns the light polarization with each of the outer polaroids, allowing some light to pass through all three. This is because the third polaroid acts as an intermediate, rotating the plane of polarization of the light from the first polaroid to a degree that partially matches the orientation of the second polaroid, thus enabling transmission of light.

A Pair of Crossed Polaroids Will Transmit Light