When a light travels from rarer medium to denser medium the angle of incidence is equal to 90 the angle of refraction is?

  1. the angle of incidence is less than or equal to the angle of refraction,
  2. the angle of incidence is less than the angle of refraction,
  3. the angle of incidence is greater than the angle of refraction,
  4. the angle of incidence is equal to the angle of refraction,