http://www.menssunglassescheap.com/surf-polarized/
why will an ideal polarized filter transmit 50 pecent of incident non-polarized ligh?
i found this question surfing on the internet , unfortunately i couldnt find the answer
i hope someone can help me
Ordinary light is randomly polarized, i.e. in all orientations. So the filter stops roughly half of it, but that's not an exact figure. Ordinary light may be partly polarized by reflection off a shiny surface like water, for example, which is why polarizing sunglasses are nice for driving.
Ordinary light is may also show weak coherence.
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