What is the shape ofthe wavefront in each of the following cases:
(a) Lightdiverging from a point source.
(b) Lightemerging out of a convex lens when a point source is placed at itsfocus.
(c) The portion of the wavefront of light from a distant starintercepted by the Earth.

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Solution

(a) The shape of the wavefront in case of a light divergingfrom a point source is spherical. The wavefront emanating from apoint source is shown in the given figure.
(b) The shape of the wavefront in case of a light emerging outof a convex lens when a point source is placed at its focus is aparallel grid. This is shown in the given figure.
(c) The portion of the wavefront of light from a distant starintercepted by the Earth is a plane.

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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.

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