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 Posted: Sat Aug 04, 2007 9:17 am
Okay, I've been thinking about the fact that light is made up of colors, and if something is green, it absorbs all colors BUT reflects green, right?
Well, if UV rays are reddish-purple, if something was that color, would it reflect UV rays and therefore not be harmed by them? I don't really have a basis for this, I'm just speculating. So, do you think this is possible? And, if so, could this help protects us from the dreaded UV rays?
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Posted: Sat Aug 04, 2007 11:00 pm
HIEILUVER Well, if UV rays are reddish-purple... This is where you fail. UV isn't reddish purple. It's beyond purple and cannot be described in terms of color; only in terms of wavelength. HIEILUVER if something was that color, would it reflect UV rays and therefore not be harmed by them? Color is the wrong term, but yes. HIEILUVER do you think this is possible? And, if so, could this help protects us from the dreaded UV rays? Yes. It's called "sunscreen".
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Posted: Sun Aug 05, 2007 5:11 am
The reflection of certain wavelengths of light to form color is more complicted than it at first appears. Substances don't just absorb certain wavelengths and reflect others, but rather can absorb and reemit certain wavelengths based on their atomic nature and chemical bond lengths. Wavelengths that cannot be absorbed either pass through a substance or are scattered. Smooth surfaces like mirrors or the surface of water can reflect light and thus produce reflections. Certain substance like ozone and zinc oxide absorb UV light and reemit it as lower wavelength light. Also some insects like bees are said to be able to see ultravioled light. Pictures taken with photographic film sensitive to UV have shown patterns on flowers in UV that are invisible under the visible spectrum. As to what "color" bees actually see the ultraviolet as is known only to them.
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Posted: Fri Nov 16, 2007 9:06 pm
It's purple because it's reflecting visible light, nothing to do with UV rays (which aren't visible at all)
http://en.wikipedia.org/wiki/Image:Atmospheric_electromagnetic_transmittance_or_opacity.jpg
That explains a tiny bit about ... stuff...
I also found this about sunscreen: In sunscreen, ingredients which absorb UVA/UVB rays, such as avobenzone and octyl methoxycinnamate, are known as absorbers. They are contrasted with physical "blockers" of UV radiation such as titanium dioxide and zinc oxide.
So there you go, sunscreen doesn't block UV rays, it absorbs them!! you learn something new every day.
http://upload.wikimedia.org/wikipedia/en/8/8a/Electromagnetic-Spectrum.png
That image really does help, it's the full electromagnetic spectrum blaugh
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