Which of the following statements is not true about refraction?

Refraction occurs when light's velocity changes.

The angle between the refracted ray and the normal is called the angle of refraction.

When light moves from a rarer to a denser medium, it bends toward the normal.

The path of a light ray that crosses the boundary between two different media is irreversible.

I'm torn between A and D

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  1. The path of a light ray that crosses the boundary between two different media is irreversible

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