How is a wave front dissimilar from a ray, Physics

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How is a wave front dissimilar from a ray?

Draw the geometrical, shape of the wave fronts when (i) light diverges from a point source, and (ii) light emerges out of a convex lens when a point source is placed as its focus.

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., 100 =6=4=9=7=9

100 =6=4=9=7=9

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