ch. 35 light
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CH. 35 Light
Kennesaw State UniversityPhysics 2212
Light• Energy of a photon:
h = Planck’s constant = 6.63 x 10-34 J.s
• Light has dual nature (wave/particle)
E=h f
Light Particle Nature
http://www.sciencemag.org/content/338/6114/1576.full
(Example) Photoelectric Effect:
Huygens’s Principle
“Any wave front can be taken as a series of point sources for the wave propagation”
Other Characteristics of Light
• Light is quantized like charge• Frequency and wavelength can change and
relate via equation:
• Light has speed (“c”) of 3.00 x 108 m/s
c=λ f
Electromagnetic Spectrum
Speed of Light
• In a vacuum:
• In a medium:
Where n = index of refraction Example: nvacuum=1 nair=1.01
c=v
v= 𝑐n
Snell’s Law
• Snell’s Law of Refraction Equation:𝑛1sin𝜃1=𝑛2sin𝜃2
Snell’s Law Critical Angle
sin𝜃c=𝑛rni
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