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The color blue
#4
It's called chromatic aberration. Shorter wavelengths of light are bent more in a lens. You can test this by making an image with three dots side by side: red, green and blue. (I'd post an image but the forum doesn't allow them for me yet.) If you're myopic, the blue dot's blur should be the biggest, followed by the green, then the red. If you're hyperopic, it's the other way around.

There are fancy lenses used in fancy photography that can focus 4 wavelengths of light perfectly at the same time. (google Superachromat) As far as I know, the human eye can only focus one.
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Messages In This Thread
The color blue - by Sypheren - 06-13-2012, 11:31 PM
Re: The color blue - by Nancy - 06-14-2012, 08:48 AM
Re: The color blue - by Sean_Augensicht - 06-14-2012, 12:52 PM
Re: The color blue - by kurluti - 09-09-2012, 07:46 PM