what type of wave front will emerge from a
1) distant light source ?
Which of these light sources will have a cylindrical wave front?
What is the shape of the wavefront in each of the following cases:(a) Light diverging from a point source.
(b) Light emerging out of a convex lens when a point source is placed at its focus.
(c) The portion of the wavefront of light from a distant star intercepted by the Earth.