Paras PadhalniKnowledge Contributor
Is the critical angle always 90?
Is the critical angle always 90?
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The critical angle is the angle of incidence where the angle of refraction is 90°. The light must travel from an optically more dense medium to an optically less dense medium. Figure 5.15: When the angle of incidence is equal to the critical angle, the angle of refraction is equal to 90°.