Defraction of Light: Why White Ray of Light Refracts in Prism

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Why white ray of light gets refracted in prism but not in plain mirror?
 
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welcome to pf!

hi vinanxi! welcome to pf! :smile:

because white light is a mixture of rays of different colours (different frequencies), all going at the same speed in vacuum or in air

when they go through a prism, they move at different speeds, but if they just bounce off a mirror, their speed is not affected :wink:
 

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