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發表於 25-9-2008 21:56:12
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Actually, a beam of light "has" many photon(a kind of particle)
and if there are many photons which is intense, coherent, monochromatic and unidirectional beam of light.
That will be laser.
(as I cannot find my notebook, I can only copy the above words from my physics book, if I can find my notebook, I wish that I can type an explaination that is easier to understand) |
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