Phys4W09Lecture11

Phys4W09Lecture11 - !1 !2 n1 sin(!1) = n2 sin(!2) n2...

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Unformatted text preview: !1 !2 n1 sin(!1) = n2 sin(!2) n2 sin(!3) = n1 sin(!4) !3 !4 !1 !2 n1 sin(!1) = n2 sin(!2) but n2 is " dependent n2(blue) > n2(red) so blue bends more So is this splitting of red and blue what causes a rainbow? Yes, sort of. Note that red is on top, not on the bottom! You see different colors from different drops. Drops in the “red” direction only send red in your direction. Drops in the “blue” direction only send blue. Other colors are bent away from you. So why two rainbows? Second rainbow, appearing above the first, is due to two reflections (hence colors are reversed). Dark region between them is due to light being bent away from you. Note that water drops are not drawn to scale here. ...
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This note was uploaded on 03/16/2009 for the course PHYS Phys4 taught by Professor Stuart during the Spring '09 term at UCSB.

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Phys4W09Lecture11 - !1 !2 n1 sin(!1) = n2 sin(!2) n2...

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