What is the geometrical shape of the wavefront in each of the following cases ? (a) Light diverg...

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What is the geometrical 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.
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