Question

Explain the difference:
(a) Point sources and extended sources of light.
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Answer 1

Answer:

Extended sources are meant to model spherical light sources. Unlike point sources, extended sources actually possess a radius, and as such are capable or producing shadows with fuzzy edges (penumbrae). ... Create an extended light source at the given position and with the given radius.

Answer 2

Answer:

Point Source of Light is that source of light which forms only the umbra region on the screen of the shadowed object.

Extended source of light

It is that source of light that forms umbra as well as the penumbra region on the screen of the shadowed object.