Which type of wavefront is formed when distance between light
source and slit is infinite, whether the source is point-size or linear?
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(a) Spherical,
The point source emits the spherical wavefront as the light diverges from a point source in all directions.
(b) Planar,
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.
(c) Planar,
(A small area on the surface of a large sphere is nearly planar). The portion of the wavefront of light from a distant star intercepted by the Earth is a plane.
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