What type of wavefront emerges from a distant light source?

1 Answer
MeneerNask
Jul 27, 2017

If the distance is great enough the front will as good as planar.

Explanation:

From every (point) light source a spherical wavefront emerges. The curvature of this sphere depends on its radius. If the distance gets greater and greater, the curvature gets smaller and smaller.
No curvature means flat plane.
Or, in "the language":

#C=1/r->lim_(r->oo) C=0#

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