Announcements 1/18/12

Prayer
Review Quiz (ungraded)

The electric field E, electrion polarization P, and
electric susceptibility c, are related through which
equation?
a. P   0 c E
b. P   0 1  c  E
c. P   0 E c
d. P   0 E 1  c 
Index of refraction
Reading Quiz

The “Lorentz model” assumes which of the
following?
a. Electron accelerated by force from oscillating
electric field
b. Electron decelerated by drag force
c. Electric attached to nuclei by spring force
d. Two of the above
e. A, B, and C
Lorentz model handout

“Driven, damped harmonic oscillator”
Reading Quiz

Which of the following is an appropriate graph of n(w)
in the Lorentz model? (Incidentally, you’ll have to
graph this with a computer for problem P2.4.)
a.
c.
1.6
1.02
1.5
1.01
1.4
1.00
1.3
0.99
1.2
1.1
5
10
15
20
0
5
10
15
20
0.05
b.
d.
0.04
1.04
1.02
0.03
1.00
0.02
0.98
0.01
0.96
0
5
10
15
20
5
10
15
20
Lorentz model, cont.

How does this oscillator model relate to index of
refraction?
Reading Quiz

In a material with electrons that have different
resonant frequencies, the strength of each
contribution to the optical properties is called
the ____________ strength
a. frequency
b. optical
c. oscillator
d. plasma
e. transition
Normal Dispersion
From Hecht, pg 72