Huygens principle

State and explain Huygens principles. Name the type of wave front that corresponds to a beam of light. (i) coming from a convex lens when point sources is placed its focus, (ii) coming from very far off source, (iii) diverging redially from a point source.

Huygen's principle is used to

Huygen's principle states that

Huygen's principle of secondary waves

Huygen's principle is applicable to

One can use Huygen's principle to

Is Huygen's principle valid for longitudinal sound waves?