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Q: When light enters the rarer medium through a denser medium, what is the effect on its speed?
  • A. increases
  • B. decreases and then increases
  • C. there is no change
  • D. decreases
Correct Answer: Option A - When the light ray of passes from a denser medium (water) to a rarer medium (air), the velocity of light increases.
A. When the light ray of passes from a denser medium (water) to a rarer medium (air), the velocity of light increases.

Explanations:

When the light ray of passes from a denser medium (water) to a rarer medium (air), the velocity of light increases.