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Railways PYQCBT 2 2017

RRB NTPC · Question 120

In which of the following case can Total Internal Reflection (when the angle of incidence is greater than the critical angle) take place? When light travels from -

  1. Glass to Diamond

  2. Diamond to Air

  3. Air to Water

  4. Air to Glass

Show answer & explanation

Answer: (B) Diamond to Air

Explanation

Total internal reflection can happen only when light goes from a denser to a rarer medium at more than the critical angle. Diamond to air fits; the other options go from rarer to denser.