Question

What is the shape of the wave front 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 wave front of light from a distant star intercepted by the Earth.

Answer 1

Answer:

Wave front - It is defined as the point where the wave has same phase throughout.

The shape of wave front in each of the following case :

a) Light diverging from a point source - It has a spherical form of wave front.

b) Light emerging out of a convex lens when a point source is placed at its focus -  It has a structure of parallel grid.

c) The portion of the wave front of light from a distant star intercepted by the Earth - It has a plane type of wave front.