The basic definition of Light:
Light is a form of energy that produces the sensation of vision in the eye by which we can see objects.
There are some facts about light as follows:
1. Lightwave moves along a straight line path.
2. Light waves can travel through vacuum and medium both.
3. Light is an electromagnetic wave.
4. A light wave is the transverse wave in nature.
5. Light can be dispersed.
Besides these facts, light also shows the phenomenon of interference, diffraction, polarisation photoelectric effect, etc.
To explain the above facts, many principles have been given from time to time, e.g., Newton's corpuscular theory, Huygen wave theory, Maxwell's principle of electromagnetic wave, Planck's quantum principle, dual nature of light, etc.
Angle of Acceptance → If incident angle of light on the core for which the incident angle on the core-cladding interface equals the critical angle then incident angle of light on the core is called the "Angle of Acceptance. Transmission of light when the incident angle is equal to the acceptance angle If the incident angle is greater than the acceptance angle i.e. $\theta_{i}>\theta_{0}$ then the angle of incidence on the core-cladding interface will be less than the critical angle due to which part of the incident light is transmitted into cladding as shown in the figure below Transmission of light when the incident angle is greater than the acceptance angle If the incident angle is less than the acceptance angle i.e. $\theta_{i}<\theta_{0}$ then the angle of incidence on the core-cladding interface will be greater than the critical angle for which total internal reflection takes place inside the core. As shown in the figure below Transmission of lig
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