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Regarding the critical angle for total internal reflection, which of these is correct: (I) the angle of refraction at the critical angle is 90°, (II) light travels from a rarer to a denser medium, or (III) light travels from a denser to a rarer medium?

1. Regarding the critical angle for total internal reflection, which of these is correct: (I) the angle of refraction at the critical angle is 90°, (II) light travels from a rarer to a denser medium, or (III) light travels from a denser to a rarer medium?

 

The critical angle is defined specifically for light travelling from a denser medium into a rarer one, at which point the refracted ray bends to exactly 90° from the normal.

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