Question

What type of wavefront will emerge from a 1) Point source 2) Distant light source

Answer 1

(1) Plane wave-front
​(2) Spherical wave-front.
A wave-front originating from the point source of light at infinite distance i.e. at very large distance is called as plane wavefront.
A wave-front originating from the point source of light at finite distance is called spherical wave-front.