Light and its properties

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 both a vacuum and a medium.

3. Light is an electromagnetic wave.

4. Light waves are transverse waves 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's wave theory, Maxwell's principle of electromagnetic waves, Planck's quantum principle, dual nature of light, etc.