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象中的光象

彩虹是因光射到空中接近球形的小水滴，造成色散及反射而成。光射入水滴同以不同角度入射，在水滴亦以不同的角度反射。中以40至42度的反射最烈，造成我所到的彩虹。造成反射，光入水滴，先折射一次，然後在水滴的背面反射，最後水滴再折射一次。因水光有色...
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