Question

Fiber optic transmission is based on the phenomenon of__________.

• A. Interference
• B. Polarization
• C. Photoelectric Effect.
• D. Total Internal Reflection

Answer 1

The correct option is D

Total Internal Reflection

Fiber optic transmission:

1. Fiber optics are long, usually very thin strands of pure glass about the size of human hair.
2. Their arrangement is like bundles and is called optical cables and is used to transmit signals over distances.
3. Fiber optic data transmission systems send information over fiber by turning electronic signals into light.

Total Internal Reflection:

1. This phenomenon is described as the complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium.
2. This occurs only if the angle of incidence is greater than the critical angle.

Explanation:

1. In fiber optic transmission, lightwave is passed as information from one side to another through a glass medium.
2. The inner region core has a higher refractive index than the cladding as shown in the diagram below.
3. Light is passed through the core and suffers total internal reflection on hitting the boundary of the core.

Hence, the correct option is option D.