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.

Dear student


(a) The point source emits the spherical wavefront as the light diverges from a point source in all directions.
(b)Plane.The shape of the wavefront in case of a light emergingout of a convex lens when a point source is placed at its focus is a parallel grid.
(c)Plane (a small area on the surface of a large sphere is nearly planar).The portion of the wavefront of light from a distant star intercepted by the Earth is aplane.


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