What is the true nature of white light?

PhilHibbs
Hi, I studied 'A' level physics back in the '80s, my dad was a physics teacher, and I have an ongoing interest in the subject. I'm particularly interested in optics. The main thing that I remember being taught incorrectly at school is that white light is a combination of red, green, and blue, which of course is just an artifact of the human visual system.
 
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