Question
Why do polarized sun glasses block out some reflected light (glare), but do not block out light that has not been reflected?
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Answer
- Some reflected light is at least partially polarized.
When ordinary (unpolarised) light is reflected from a surface, it gets partial polarisation, it means some of the electric vectors in some planes are cut-off. When this partially polarized light is incident on polarized glasses, glass acts as an analyser and therefore block out some reflected light.
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