Question:
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.
Answer:
(a)
The shape of the wave front in case of a light diverging from a point source is spherical and is shown in the given figure.
(b)
The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid.
(c) The portion of the wavefront of light from a distant star intercepted by the Earth is a plane.
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