NCERT Exercise 10.2 - Wave Optics
Question: 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. (c) The portion of the wavefront of light from a distant star intercepted by the Earth.
Answer: **NCERT answer:** (a) Spherical (b) Plane (c) Plane (a small area on the surface of a large sphere is nearly planar).
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