Question

what is the shape of wavefront at infinite distance from a point source

Answer 1

but when you considered it a large distance and measuring justice Mall section of it then it can be considered to be plane wavefront source at Infinity example the one coming from sun to earth surface is considered to be plain VU friend from light diverging from a point source will be spherical

Answer 2

Wavefront is a commonly used term if we are studying about waves. It refers to such a surface on which a wave has a non-changing points. It can also be defined as a group of points of wave where each point has the similar positioning. One of the best examples of wavefront to understand the term is the entire set of crests form during the formation of ripple in water.

Mainly, there are about three types of wavefronts which are named below:

1. Spherical Wavefront

2. Plane Wavefront

3. Cylindrical Wavefront

✍✍ Check the attached picture for the desired answer :) ✍✍

If we are close to the source of light, then the wavefront will appear to be spherical. Opposite to what discussed earlier, if we are far from the source of light, then the wavefront will appear to be plane. In your case, it will be plane wavefront.