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Old 04-07-2014, 11:50 AM
2,483 posts, read 2,740,344 times
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A week or so ago, I got a new pair of polaroid sunglasses. True to all laws of nature, we have had only one day of sunshine since. But, no matter there. On that off-and-on sunny day, I went outside to try out the glasses. The lenses are brown. That is clear to see. However, when I took them off and held them lens-side-up toward the sky, they appeared blue. I think brown has no blue. Brown is red, orange and green on the prism scale. I tried the internet with my 'why' and didn't find much. I did find this one sentence at an optical site:

"Brown filters out blue." Is that why? The brown lens "rejects" the blue. And is this the blue that is part of the green in brown? Or is it just the blue of a prism?

Thank you.
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