define the point source and extend source and draw a well legally digram
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Point source is particularly localised emission or source of light at a point which decreases in proportiom to the inverse square of distance from the source while extended source are collection of such point sources of light together.
An extended source is a source whose angular size exceeds the resolution of the instrument being used to observe it. Extended sources, such as many galaxies and nebulae, can be resolved by telescopes, whereas most stars cannot and are therefore classes as point sources.
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