Class15HO

# Class15HO - Class 15 Geomtric Optics Reflection and...

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Unformatted text preview: Class 15 Geomtric Optics: Reflection and Refraction Physics 106 Fall 2011 Press CTRL-L to view as a slide show. Learning Outcomes Last time we discussed: I The Series RLC Circuit I Power in AC Circuits I Resonance I Transformers I Radiation Learning Outcomes Today we will discuss: I What you should know about electromagnetic radiation I What is light? I Reflection I Refraction and Snell’s Law I Total Internal Reflection Electromagnetic Radiation A Review The Fields of Accelerating Charges I Moving charges produce both electric and magnetic fields I Acceleration fields are "doglegs" in field lines produced when charges accelerate. I Acceleration fields become perpendicular to the direction the filed moves. I Acceleration fields fall off as 1 / r rather than 1 / r 2 . Electric Fields of Accelerating Charges I A charge accelerates to 50% of the speed of light and then is then stopped. Electromagnetic Waves are Transverse Waves I The electric and magnetic fields are perpendicular to the line of motion. I When you rotate E into B, you get the direction of motion. Electromagnetic Waves are Transverse Waves I At a point where the electric field is large, the magnetic field is also large. I In a wave E max = cB max Energy of an EM Wave I The energy density in the wave is: u = U Vol = 1 2 E 2 rms + 1 2 μ B 2 rms I The two terms equal each other. The Electromagnetic Spectrum I Radio Waves I Microwaves I Infrared light I Visible light I Ultraviolet light I X rays I γ rays What is Light? A Brief History of Light I Greeks I The eye sends out a signal that ablates a tiny amount of the surface of matter and returns it to the eye I Ren Descartes- early 17 th century I Light is pressure in "second matter" that fills space I Christiaan Huygens- later 17 th century I Used Descartes’s model to describe reflection, refraction, and "Huygens’s principle" I Isaac Newton- late 17 th century I A "corpuscle" model based on Newtonian mechanics was used to explain reflection, refraction, and color I The particles’ "fits" explained Newton’s rings, an interference phenomenon A Brief History of Light I Thomas Young- 1801 I Demonstrated interference with slits, something that was hard to explain with Newton’s theory I Augustin Fresnel- mid 19 th century I Advocated a wave model of light and did experiments that verified his ideas I James Clerk Maxwell- 1860s I Believed that light is an electromagnetic wave I Optics became based on electromagnetic theory A Brief History of Light I...
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Class15HO - Class 15 Geomtric Optics Reflection and...

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