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Once light is generated at the source, where does it go ?

Once light is generated at the source, where does it go and when does it stop being light ?

 

Asked Laurence Simons

 

Answer:

Light is an electromagnetic wave. Once it is produced, it will travel out for ever if not absorbed or scattered. In vacuum there is nothing to absorb or scatter the light. So it will travel forever in vacuum. When it enters a medium it may be absorbed, reflected/scattered or transmitted.

 

You may refer to these links for more info

https://www.wired.com/2015/02/5-things-every-human-know-light/

https://van.physics.illinois.edu/qa/listing.php?id=21368

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