Speed of light in denser and rarer medium.

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PrincePhoenix
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I was studying refraction and as I've heard and read, it occurs due to difference between speed of light in the rarer and denser medium. But isn't speed of light common for all observers? Please don't make fun of me if I've made a stupid mistake somewhere.
 
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PrincePhoenix said:
But isn't speed of light common for all observers?

Yes, but only in a vacuum.
 
Oh. Thank you for the answer.
 

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