Question

The wave front due to a point source at a finite distance from a source is

Answer 1

A sheet of paper measuring by a rectangle with the number which are in proportion of a triangle is ko bharba I

Answer 2

In physics, a wavefront is defined as the locus of points enhanced by propagation of positions of identical phases.

It includes propagation of a point in 1D, a curve in 2D or a surface in 3D.

For an electromagnetic wave, the wavefront is represented as a surface of identical phase, and conventional optics can be used to modify it.

Wave front due to a point source at a finite distance from the source is spherical.

So, the answer is spherical wavefront.