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A red apple is every colour but red, this is because white light is a combination of every colour so when white light goes into an object it absorbs every colour but red which it rejects making it every colour but red. Neil Degrasse Tyson ( an astrophysicist ) covers this and probably explains this better on his YouTube series Startalk.

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Jacob Riddle

Lvl 2
3y ago

What else can I help you with?