Optical Fiber works on the principle of-
Correct Answer : b ) Total Internal ReflectionExplanation :
Optical Fiber works on the principle of Total Internal Reflection. Total Internal Reflection is the phenomenon in which a light ray travels from a denser to a rarer medium and the angle of incidence exceeds the critical angle and the rays are reflected towards a denser medium.
Optical Fibre transmits information as light pulses along with a plastic or glass fiber. It is slightly thicker than a human hair. In the case of optical fiber, if the light is incident at an angle greater than the critical angle, the light will remain trapped and will travel a long distance without any significant losses.
Hence, option (B) is correct.
This question was asked in RRB NTPC CBT 2 exam held on 17 January 2017 Shift 1.