For total internal reflection

Options :
  1. the ray must travel from the rarer to denser medium
  2. the ray must travel from denser to rarer medium and the angle of incidence should be more than the critical angle
  3. The angle of incidence must be equal to critical angle
  4. the angle of incidence must be less than critical angle
Answer and Explanation :-

Answer: Option 2

Explanation:

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