Madhya Pradesh Police Exam Model Paper 1

The correct answer is Total internal reflection .

• Total internal reflection:
  • It is the phenomenon that involves the reflection of all the incident light off the boundary.
  • It only takes place when both of the following two conditions are met:
    • The light is in the more dense medium and approaching the less dense medium.
    • The angle of incidence is greater than the so-called critical angle.
• Total internal reflection will not take place unless the incident light is travelling within the more optically dense medium towards the less optically dense medium.