Multiple choice

Out of the following media, the minimum speed of light will be in

  1. vacuum

  2. air

  3. water

  4. glass
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Light travels slowest in glass because glass has the highest refractive index (~1.5) among these options. Higher refractive index means slower speed. Vacuum has the fastest speed (n=1), followed by air (n≈1.0003), water (n≈1.33), and glass (n≈1.5).

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