Question

define a wave front using hyugens principal. draw the shape of the refracted wave front when a plain wave is incident on a convex lens​

Answer 1

Explanation:

The locus of points, which oscillate in phase is called a wavefront; thus a wavefront is defined as a surface of constant phase. In the given figure we consider a plane wave incident on a thin convex lens, the emerging wavefront is spherical and converges to point F which is known as the focus.