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and put a second prism there.
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And he wrote here, three times--
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he wrote it here, and also here,
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which means "the broken light does not change its color.
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So this proved to Newton, at least at that time,
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that light is a substance, not a train of pulses.
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What do you think of that proof now?
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You think light is a substance or a train of pulses?
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Both.
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Neither.
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But at least you can see that in terms then,
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that was a crucial experiment, a really important experiment,