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Old Feb 27, 2010, 6:50 AM   #31
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Location: North Central Iowa
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I saw mention of using two polarizing filters to futher adjust the light coming through, and this reminded me of an effect my high school physics teacher showed us to illustrate the particle vs. wave nature of light.

One polarizing filter will cut the light that is oscillating in a certain direction, or range of directions, advantageous when light is bouncing off the surface of water causing glare, etc.

Anyway, take a second polarizing filter with it's filter at 90 deg to the first, and it blocks 100% of the light coming through. No surprise yet, but...

Take a third polarized lens, insert it between the other two with its filter oriented at 45 deg and light will pass through.

The reason for this was explained as, aw heck I'll just shut up now. But its pretty neat to see. Now I have to get some filters and show my kids...
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