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Question -

What is the shape of thewavefront in each of the following cases:

(a) Light diverging from a pointsource.

(b) Light emerging out of a convexlens when a point source is placed at its focus.

(c) The portion of thewavefront of light from a distant star intercepted by the Earth.



Answer -

(a) The shapeof the wavefront in case of a light diverging from a point source is spherical.The wavefront emanating from a point source is shown in the given figure.

(b) Theshape of the wavefront in case of a light emerging out of a convex lens when apoint source is placed at its focus is a parallel grid. This is shown in thegiven figure.

(c) Theportion of the wavefront of light from a distant star intercepted by the Earthis a plane.

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