Announcements 2/8/12
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
Prayer
Exam review lecture on Friday
a. Sign up for one of the exam review problems
(I’m passing around a sheet).
b. There are 10 problems. Each problem will get
2-3 students. Do not be the third student to
sign up for a problem until all problems have
2 students.
c. Pass the sign-up sheet back and I’ll read out
the final groups at the end of class.
d. See my email from Monday for more details
(email me solution in pdf form, etc.)
Reading Quiz

An “optic axis” is a direction for which:
a. one of the two n values is complex
b. one of the two n values is equal to 1
c. the two n values are the same
d. the two n values sum to 1
Example 4 from last time
1.2



n
1.3



1.4


n = 1.3 is one of the n’s
k in  0.746712, 0, 0.665148 direction
k in  0.746712, 0,  0.665148  also works
in x-z plane, and
Reading Quiz

In a uniaxial crystal, the index of refraction matrix,
 nx

n


a.
b.
ny
 ne

n


 no

n




 has the form:
nz 
ne



ne 
no



no 
c.
d.
 no

n


 no

n


ne
no



ne 



ne 
Uniaxial Crystals
Optic axis along surface

Normal incidence
Reading Quiz

In a uniaxial crystal, which vector always obeys
Snell’s law?
a. k (wavevector)
b. S (Poynting vector)
c. neither k nor S
Thought question (ungraded)

T/F: In the situation depicted
(note the orientation of the zaxis!), s-polarized light will see
n=no inside the crystal,
regardless of angle.
a. True
b. False
Optic axis perpendicular to surface

At an angle

s-polarized (easy!)…
Optic axis perpendicular to surface

p-polarized (hard!)
a. “Snell’s Law” replacement
b. Direction of Poynting vector (energy flow)
Exam 1: Chapters 1-5
Starts Fri, Feb 10
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Ends Tues, Feb 14
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Exam info
a. 10 multiple choice problems, 1.5 pts each
– A few are from the true/false review questions. I
won’t tell you the answers to the T/F questions, but
you should definitely talk amongst yourselves.
b. 8 worked problems
– Two of them involve written explanations
– One involves sketching a few graphs
– One is a review problem we’ll cover Friday (lucky
group!)
c. Expected average time: 2 hours
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