Total internal reflection, where the angle of incidence exceeds the critical angle, can occur when light travels from?

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1. Total internal reflection, where the angle of incidence exceeds the critical angle, can occur when light travels from?

Glass into diamond

Air into water

Air into glass

Diamond into air

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Total internal reflection requires light moving from a denser medium into a rarer one. Of these options, only diamond into air fits — diamond is denser than the surrounding air.