The phenomenon due to which optical wave propagation is possible in optical fiber is called?

Correct option is D

In an optical fiber, light propagates through the core due to the phenomenon of total internal reflection. This occurs when:
1. Light travels from a medium with a higher refractive index (core) to a medium with a lower refractive index (cladding).
2. The angle of incidence is greater than the critical angle for the core-cladding interface.
This ensures that light is reflected entirely within the core and continues to propagate along the fiber.
Use of optical fibers:-
In the communication of light signal.
In data transmission.