Acceptance Angle in Optical Fibre Calculator

The acceptance angle in an optical fibre is a fundamental concept in physics, particularly within the realm of optics and telecommunications. This tutorial will cover the formula for calculating the acceptance angle, its derivation, who refined this formula, real-life applications, key individuals in this field, and some interesting facts about how this discipline has influenced our world.

Acceptance Angle in Optical Fibre Calculator
Electromagnetism_Acceptance Angle in Optical Fibre Calculator Results
Acceptance Angle = °

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The acceptance angle (θa) in optical fibre is defined by the following formula:

sin θa = √(n21 - n22)


  • n1 is the refractive index of the core,
  • n2 is the refractive index of the cladding.

This formula is derived from Snell's Law and the principle of total internal reflection.

Who wrote/refined the formula

While the specific person who developed this formula is not credited individually, it is essentially based on Snell's Law, discovered by Willebrord Snellius in 1621. It was later refined by scientists working in the field of optical fibres, a key technology in telecommunications and material science.

Real Life Application

In real life, the concept of the acceptance angle in optical fibres is used in the design and operation of fibre-optic communication systems. These systems transmit information from one place to another by sending pulses of light through an optical fibre. The light forms a carrier wave that is modulated to carry information. By using the correct acceptance angle, we can ensure that light is totally internally reflected within the fibre and reaches its destination.

Key individuals in the discipline

Charles Kao, awarded the Nobel Prize in Physics in 2009, is a key figure in the field of fibre optics. His work in the late 1960s laid the groundwork for the development of optical fibre telecommunications. Specifically, he proposed that the high-loss of existing telecommunications cables was due to impurities, which could be removed, rather than a fundamental flaw in the technology itself. This insight has enabled the high-speed, long-distance optical fibre networks we rely on today.

Interesting Facts

  1. The acceptance angle concept and its application in optical fibres have revolutionized telecommunications, enabling the high-speed internet connections we rely on for everything from streaming video to conducting international business transactions.
  2. Thanks to the development of optical fibres, we can now transmit information over long distances with minimal loss of signal, a dramatic change from earlier cable-based systems.
  3. Optical fibre technology has not only revolutionized telecommunications but also had a significant impact on medical imaging, sensors, and lighting.


The concept of the acceptance angle in optical fibre, while seemingly abstract, plays a crucial role in our daily lives. Without it, we wouldn't have the advanced telecommunication systems and internet capabilities we rely on today. As we continue to rely on and advance fibre optic technology, understanding the physics behind it, including the acceptance angle, is essential.

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