Regarding the change in a light ray’s velocity due to refraction, which statement is correct?

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1. Regarding the change in a light ray’s velocity due to refraction, which statement is correct?

Velocity increases as the ray passes from a rarer to a denser medium

Velocity decreases as the ray passes from a denser to a rarer medium

Velocity decreases as the ray passes from a rarer to a denser medium

The change of velocity never depends on the nature of the medium

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Entering a denser medium always slows a light ray down — this is precisely why it bends toward the normal in that direction.