Cross polarized filter

Cross polarized filter

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Cross polarized filters pass virtually no light. Light from a source vibrates in many planes. Polarizing filters absorb or reflect light that is polarized perpendicular to their polarizing axis. When they are parallel to each other, the transmission is maximised. When they are perpendicular to each other (an angle of 90 degrees), the transmission falls to close to zero (black area). When at a relative angle of 45 degrees, the transmission is between these values.

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