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Q: When light passes from water to air then –––––– changes.
  • A. Wave length
  • B. its frequency
  • C. its colour
  • D. its speed
Correct Answer: Option D - When light travels from one medium to another, it changes the speed at which the light travels. • When a ray light passes from water to air that is it travels from denser to rarer, so the speed of light increases. • When it enters from rarer medium to denser medium then the speed of light decreases.
D. When light travels from one medium to another, it changes the speed at which the light travels. • When a ray light passes from water to air that is it travels from denser to rarer, so the speed of light increases. • When it enters from rarer medium to denser medium then the speed of light decreases.

Explanations:

When light travels from one medium to another, it changes the speed at which the light travels. • When a ray light passes from water to air that is it travels from denser to rarer, so the speed of light increases. • When it enters from rarer medium to denser medium then the speed of light decreases.