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光者,目之所見也,常謂之可見光,實為電磁波也。可見光者,電磁波譜段也,波長約四百至七百奈米,長於紫外線,短於紅外線。對於波長之域、各書之義不一,窄如四百二十至六百八十奈米,闊如三百八十至八百奈米也。
光者,既為波,亦為粒子、即光子,故有謂波粒二象性。
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