3. Sketch the wavefronts corresponding to a slit source and parallel rays of light
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What is the shape of the wavefront in each of the following cases ? <br> (a) light diverging from point source. <br> (b) light emerging out of a convex lens when a point source is placed at its focus. <br> ( c) the portion of the wavefront of light from a distant star intercepted by earth.
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