Optical Fiber works on the principle of ______.

The correct answer is Total Internal Reflections.

Key Points 

• Optical Fiber works on the function of Total Internal Refraction.
• Optical fiber transmits signal from one place to another without any loss of energy.
• It is free from any electromagnetic interference.
• As the optical fiber do not carry any high voltage so they are safe for electric cable.

​ Additional Information

• In 1966 Charles Kao and George Hockham suggested using fibres for telecommunication.
• In 2009 Charles Kao was awarded the Nobel Prize in Physics for his work.
• Optical telecommunication is usually conducted with infrared light in the wavelength ranges of 0.8–0.9 μm or 1.3–1.6 μm.

​ Important Points

• Total Internal Reflection: Complete reflection of a ray of light within a medium (water/glass) from the surrounding surfaces back into the medium.