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The light from the light source when travelling through a medium thickness, different certainly caused by refraction in a straight line when walking through an intermediary with the same density as the medium of the same type. The lens and Prism as the device that is causing the deviation of a beam that shines through. It differs in that the prism can separate out the transmitted beam is light in different colors according to the elements of light, or the so-called spectral (spectrum) (12.5 images)
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