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What is the shape of the wavefront in ea...

What is the shape of the wavefront in each of the following cases ?
(a) light diverging from 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 earth.

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(a)spherical wavefront , (b)Plane wavefront , (c )Plane wavefront
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