Reflection

Reflection - Light frequency doesnt change going from one...

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Liu UCD Phy9B 07 1 Ch 33. The Nature and Propagation of Light
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Liu UCD Phy9B 07 2 33-1. Nature of Light Light has both wave and particle properties Particle-like: emission, absorption… Wave-like: propagation, interference… Speed of light c=2.9979x10 8 m/s ~ 3.0x10 8 m/s
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Liu UCD Phy9B 07 3 Ray: an imaginary line along the wave traveling direction In a particle theory of light Light travels in straight-line paths called light rays Rays represent the paths of particles Branch of optics dealing with ray model – geometric optics wave behavior – physical optics
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Liu UCD Phy9B 07 4 Angle of incidence θ i Angle of reflection θ r Law of reflection: θ i = θ r Diffusive reflection Specular reflection
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Liu UCD Phy9B 07 5 Refraction Index of refraction of a material: n=c/v 1 c=3.0x10 8 m/s speed of light in vacuum v: speed of light in the medium
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Unformatted text preview: Light frequency doesnt change going from one material to another = / n Higher n slower v smaller Vacuum & air: n=1.00 Water n=1.33 Glass n=~1.4-1.6 Liu UCD Phy9B 07 6 Law of Refraction Snells Law n 1 sin 1 =n 2 sin 2 If n 1 > n 2 , then 1 < 2 Liu UCD Phy9B 07 7 General Case: Across Interface of Two Transparent Materials Incident, reflected, refracted rays and the normal to the surface all lie in the same plane. Liu UCD Phy9B 07 8 33-3. Total Internal Reflection a b a b C n n n n = = 90 sin sin When > C , all lights are reflected, no refraction Only happens when light goes from high n to low n material n b <n a Liu UCD Phy9B 07 9 Applications of Total Internal Reflection Porro Prism Fiber Optics Liu UCD Phy9B 07 10 33-4. Dispersion n=c/v, depends on wavelength...
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This note was uploaded on 02/17/2009 for the course PHY na taught by Professor Richardscalettar during the Spring '09 term at UC Davis.

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Reflection - Light frequency doesnt change going from one...

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