Light travels slower in glass than in air because

Options :
  1. refractive index of air is less than that of glass
  2. refractive index of air is greater than that of glass
  3. density of glass is greater than that of air
  4. density of glass is less than that of air


Answer and Explanation :-

Answer: Option 1

Explanation:

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Immer wieder behauptete Unwahrheiten werden nicht zu Wahrheiten, sondern, was schlimmer ist, zu Gewohnheiten.
-Oliver Hassencamp