PHYSICS 002C
Lecture 11
April 22, 2009
DEMO
and
Q: Polarization and Malus’s law
θ
2
0
cos
I
I
=
. Two
Polaroid sheets rotated from the maximum transmission
configuration by an angle of 60
o
transmit what fraction of incident
light intensity? a) 1 m;
b) 10 m;
c) 100 m;
d) 1 km;
e) 1 mm.
New material -
Chap 24.9
–
Stimulated emission
Lasers are used for manipulating cells, for measuring biological
forces, for fluorescence microscopy, for cutting and suturing, for
seeing inside the body, for measuring velocities of particles in the
blood, ….
Stimulated emission, identical photons, and time reversal
invariance.
Serway and Jewett Chapter 25 – Reflection and refraction
New Material -
Chap 25.1
–
The nature of light
Newton’s corpuscular theory of light
(ca. 1700) – Light travels in
rays (straight line paths) like a stream of massless particles.
Huygens wave model or Huygens’ principle
(1678) – Light is a
wave; each wave crest is a source of more waves, such that each
point on a wave crest generates a spherical wave. The new waves
add to explain reflection and refraction.
Young’s interference experiments
(1801) proved that light behaves
like a wave, as did
Maxwell’s theory
(1865) and
Hertz’s wave
experiments
(1887).
BUT….
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- Spring '08
- ALL
- Physics, Light, Polarization, Total internal reflection, wave equation, Geometrical optics
-
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