Bouncing Beams and Sticky Glass 5.2.2 EM Wave Phenomenon.
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Transcript of Bouncing Beams and Sticky Glass 5.2.2 EM Wave Phenomenon.
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Bouncing Beams and Sticky Glass
5.2.2 EM Wave Phenomenon
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Reflection
• Waves that change mediums or hit boundaries obey the Law of Reflection.
• Angles are always measured from the normal!
Equation
ri
θi θr
incidentray
reflectedray
normal
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Refraction
• Fast Slow = away from normal
• Slow Fast = toward normal
Equation
Snell’s Law2211 sinsin nn
θr
incidentray
reflectedray
normal
θ2
refractedray
n1
n2
θi or θ1
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Refraction• Wavelengths change with corresponding differences in
speed.
Equation
2
1
2
1
1
2
vv
nn
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Refraction (Special Cases)- Special cases in which no bending occurs…
- Two mediums with the same index of refraction.
- A ray entering another medium at an angle of 0°
corn oilglycerol
airdiamond
n1sinθ1 = n2sinθ2
1.47 sinθ1 = 1.47 sinθ2
θ1 = θ2
n1sinθ1 = n2sinθ2
1.0 sin 0° = 2.42 sinθ2
0 = 2.42 sinθ2
θ2 = 0°
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A ray of light with a frequency of 5.09 x 1014 hertz moves from air into flint glass. The angle with which the ray strikes the surface of the flint glass is 40° away from the normal. Which is the faster medium? Determine the angle of refraction. Draw the refracted ray.
airflintglass
n1sinθ1 = n2sinθ2
1.00 sin 40° = 1.66 sinθ2
θ2 = 23°
air is faster (lower index)
Example
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The Wave Nature of Light• Consider each of the 8 phenomenon. Which of them
could be demonstrated with light? Which are PROOF that light has a wave nature? Which can also occur with particles?
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ReflectionWorks with BOTH particles and waves.
NOT proof that light is a wave.
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Interference
ONLY occurs with waves.
Supports wave model of light.
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Standing WavesWaves ONLY.
Lasers – supports wave model.
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ResonanceWaves ONLY.
Lasers – supports wave model
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Doppler EffectWaves ONLY.
Red shift/Blue shift – supports wave model.
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Diffraction
Waves ONLY.
Supports wave model.
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RefractionDoes not DIRECTLY support
wave model.
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PolarizationWaves ONLY.
Supports wave model.
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Double Slit ExperimentThomas Young’s double slit experiment is the best demonstration
of light’s wave nature as it combines both diffraction and interference.
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End of 5.2.2 - PRACTICE