词典释义：
n.临界角
It occurs when angle of incidence is greater than a certain limiting angle, called critical angle.
当入射角大于某个称作临界角的极限角时, 便发生全内反射.
At all angles less than the critical angle, Both reflection and refraction occur.
的入射角, 则既发生反射,又发生折射.
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