The wave theory of light was given by

Explain the use of wavefront to understand wave propagation.

Explain the reflection of a plane wave using Huygens' principle.

Which of the following is correct for light diverging from a point source?

State Huygens' principle. What is the fundamental principle on which it is based?

On a hot summer night,the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally,the Huygens' principle leads us to conclude that as it travels,the light beam