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So, is it wrong to teach K-6 students that light slows down while it's
inside a transparent material? If so, then I don't know how to explain
lenses and prisms to eleven year old children.
Is it wrong to teach that light is made of propagating EM fields? If so,
if light is "really" Feynman virtual photons, how can I explain certain
field phenomena such as polarization? Also how do I explain magnets?