Describe Huygens, principle related to the propagation of light waves.

Huygen.s principle is used

How is a wavefront defined? State Huygen's principle of propagation of light wave.

State Huygen's principle for propagtion of light wave .

With the help of a diagram,explain the Huygens' principle for the propagation of light in a medium.

State Huygen's principle of propagation of light and prove the laws (Snell's law) of refraction on its basis.

By using Huygen’s principle prove the laws of refraction of light.