Explain This
The Physics of the Human Eye Graphic from dorling kindersley books website
Video Instruction
D. Index of Refraction (n) – a comparison of speed of light in a substance to its speed in a vacuum
If a substance has an index of refraction of 2.00 it means light is twice as fast in a vacuum than it is in that medium
c = speed of light in a vacuum v = speed of light in a medium
nvacuum = 1.00
nair ≈ 1.00 , v ≈ 3 x 108 m/s
Which substance slows down light the most when light enters from air?
Diamond,
least?
Water
Ex 1) Speed of light in alcohol?
n = 1.36
n = 1.36 = c/v
1.36 = (3.00 x 108 m/s)/V
3.00 x 108 m/s = 1.36V
V = 2.21 x 108 m/s
n & v relationship? n = c/v
Inverse
1. Prediction θref from θin
a. Snell's Law
1 – incident medium
2 – refractive medium
Air/Lucite
n1sinθ1 = n2sinθ2
1.00 sin53 = (1.50) sinθ2
.798 = 1.50sinθ2
.798/1.50 = sinθ2
.532 = sinθ2
θ2 = 320
Ex) Light refracts as it moves from water to flint glass. Which angle is bigger, qin or qref?
Faster medium has bigger angle
Water 1.33?? or Flint glass 1.66??
Angle of Incidence bigger, Water faster
Fooling Drinkers With Refraction
More Refraction Equation Instruction
Enrichment NOVA (PBS) explains how refraction makes diamonds sparkle
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