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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the greater number of a man's errors come before him disguised under the specious form of necessity then, after error has been committed in a moment of excitement, of delirium, or of fear, we see that we might have avoided and escaped it.
-Alexandre Dumas The Count of Monte Cristo