Old 09-16-2009, 08:34 PM #1
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Question Interesting question

Interesting question I was at the movies when i got a weird question in my head that i canít seem to find the answer to... Normally a laser (except 405nm) under 200mW can't do much to white surfaces, but what if its a theater screen, and the projected image is black??? Will it burn the screen then? I think it may just bleach out the black color and do nothing, but Iím not too sure as i can burn out TV screens with a 200mW dilda...

Thanks
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Old 09-16-2009, 08:36 PM #2
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Default Re: Interesting question

Well at least if I hear about a movie theater being set on fire on the news, I'll know who it was

My guess is white is white.
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Old 09-16-2009, 08:39 PM #3
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Default Re: Interesting question

Quote:
Originally Posted by mfo View Post
Well at least if I hear about a movie theater being set on fire on the news, I'll know who it was

My guess is white is white.
Haha I don't plan on testing to see what happens, thats why i ask the question.
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Old 09-16-2009, 08:54 PM #4
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Default Re: Interesting question

The answer is no. A white surface is still a white surface regardless of the light that is cast on it. A white surface that looks red because it has red light on it is still a white surface.
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Old 09-16-2009, 11:59 PM #5
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Default Re: Interesting question

Just because it's not currently reflecting light doesn't mean it no longer reflects light. If the projected image is black, it just means there's no light shining on it. All the colors of light that hits it will still reflect, hence it being white, it just happens there's no light shining on it when it's black.

And as far as one color of light affecting another color of light hitting the same object in general, you need to look up something called superposition.
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