Polarization

A modification of direct reflection that causes it to be visible at only a single view point. A perfectly polarized reflection is exactly as bright as an unpolarized reflection. Different objects emit a combination of polarized and unpolarized reflections in varying proportions. Photographers often use polarizing filters to block glare. It is not possible to polarize reflection without introducing some absorption that will reduce the brightness of the reflected light. Polarized reflections on black and transparent objects are easier to see due to their weaker diffuse reflections. Objects that conduct electricity are unlikely to produce polarized reflections while insulators are likely to produce polarized reflections. Objects that look like a mirror are more likely to be producing simple direct reflection than objects that do not.

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