question_answer

                Transmission of light in optical fibre is due to:                                                                                    

A)                 scattering

B)                 diffraction          

C)                 polarization       

D)                 multiple total internal reflections

Correct Answer: D

Solution :

                An optical fibre is a device based on total internal reflection by which a light signal can be transferred from one place to the other with a negligible loss of energy.                 It consists of a very long and thin fibre of quartz glass.                 When a light ray is incident at one end A of fibre making a small angle of incidence. It suffers multiple total internal reflections and finally it reaches the point B.