What is the shape of the wave front 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 wave front of light from a distant star intercepted by the Earth.
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Wave front - It is defined as the point where the wave has same phase throughout.
The shape of wave front in each of the following case :
a) Light diverging from a point source - It has a spherical form of wave front.
b) Light emerging out of a convex lens when a point source is placed at its focus - It has a structure of parallel grid.
c) The portion of the wave front of light from a distant star intercepted by the Earth - It has a plane type of wave front.
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