Unformatted text preview: example, when light reflects off of surfaces it is partially polarized. Some sunglasses contain polarizing filters which helps to block glare (such as the glare that is noticeable when looking out over a lake on a sunny day).
Polarized Light Glare Continued Continued Polarized Light (cont.)
Unpolarized light propagates in all orientations. No particular orientation is
preferred. When it passes through a filter that only allows vertical
components of electric fields to pass, its intensity is cut in half. This is
because, on average, the light is “half horizontal and half vertical” in terms
of electric field components. All horizontal components are blocked, making
the resulting polarized light half as bright.
Now, imagine that you place another filter that is perpendicular to the
direction of the first one, i.e., a filter that only allows the horizontal
components of electric fields to pass through. This would completely block
the remaining light. Thus, any two perpendicular filters will block all
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