what is wave front? Draw wave front for point source of light, slit source parallel light rays.
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The shape of the wave front in case of a light diverging from a point source is spherical and is shown in the given figure. The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid.
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a) Spherical wave front : All particles vibrating in same phase will lie on a sphere.
(b) Plane wave front: Light will be a parallel beam after passing through the convex lens.
(c) Plane wave front : Light rays from a distant star are nearly parallel as a small portion of a huge spherical wave front is nearly plane.
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