Humans view bees view light in clear materials

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Unformatted text preview: on Tuesday, November 12, 2013 Aside: bee’s eyes! humans: 390-750nm human’s view Tuesday, November 12, 2013 bees: 300-650nm Bee’s view Bees see UV spectrum (small wavelength) that we cannot see. Flowers evolve to look especially pretty for the bees, with bullseye targets, visible in the UV spectrum. human’s view Bee’s view Light in clear materials Maxwell’s eqns. in materials: µ0 → µ ￿0 → ￿ Magnetic permeability and electric polarizability. If you’ve seen this in Phys 2B, great - if not, don’t worry about it. We don’t really need much here. All we need to know is that we again find Maxwell’s equations admits wave solutions, but the velocity of the wave is modified by the material: 1 v=√ Tuesday, November 12, 2013 µ￿ ≡ c/n. Index of refraction n Light effectively moves slower than c in materials, because it has to bounce around through an obstacle course of atoms. Amount of slowing depends on the material, it’s density etc. Write it as v = c/n ≤ c n≥1 Aside: Actually, it’s possible to design exotic “metamaterials,” with negative index of refraction! Pioneered her...
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This note was uploaded on 02/11/2014 for the course PHYSICS 2C taught by Professor Hicks during the Fall '09 term at UCSD.

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