How does a prisim seperate white light? Why isn’t black/brown in the rainbow. And I heard that black is not a real

How does a prisim seperate white light? Why isn’t black/brown in the rainbow. And I heard that black is not a real colour or in nature and it is man made. Is that true?

Posted on June 19, 2013 by in Question. Comments Off on How does a prisim seperate white light? Why isn’t black/brown in the rainbow. And I heard that black is not a real