Explain the difference:
Point sources and Extended sources.

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Solution

Point sources Extended sources

1. A source of radiation light that is concentrated at a point and considered as having no spatial extension. 1. An extended source is a source consisting of many point sources separated internally.

2. Shadow we get from a point source is dark called umbra. 2. Shadow we get from extended source of light is faint called penumbra and dark called umbra

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Point sources	Extended sources
1. A source of radiation light that is concentrated at a point and considered as having no spatial extension.	1. An extended source is a source consisting of many point sources separated internally.
2. Shadow we get from a point source is dark called umbra.	2. Shadow we get from extended source of light is faint called penumbra and dark called umbra