Question

1.Optical fibre works on which of the

following principle of light?

A. Reflection

B. Refraction

C. Diffraction

D. Total internal reflection​

Answer 1

Ans. D

Sol. Optical fibre works on Total internal

reflection. It is the phenomenon which

occurs when a propagated wave strikes a

medium boundary at an angle larger than

a particular critical angle with respect to

the normal to the surface.

thanks for Q

Answer 2

Answer:

optical fiber works on the principles of

OPTION D total internal reflection (TIR)

TIR or total internal reflection is which when a ray of light passes through denser to rarer medium after refraction the ray bends away from the normal

if angle of incidence increases = angle of refraction increases

if we increases angle of incidence beyond the critical angle. the ray will reflect backwards to the same medium. this phenomenon is called total internal reflection