1. Announcements 3/14/12 Prayer Happy Pi day!
Exam 2: on track to finish by tomorrow morning
Frank &
Ernest

2. A More General View of Focusing

3. Reading Quiz A complex imaging system can be reduced to an equivalent:
thin lens
thick lens
thin plate
thick plate

4. Reading Quiz
The effective beginning and end of the equivalent thin lens are called the ______ planes
dominant
primary
principal
secondary
serving

5. Principal Planes

6. Reading Quiz For a laser cavity to be stable, the rays
must get back to the same height after one round trip
must get back to the same height after an infinite number of round trips
must remain at a finite height after an infinite number of round trips

7. Result: should be stable if 1/2 (A + D) is between 1 and -1
Laser Cavities
Result: should be stable if 1/2 (A + D) is between 1 and -1

8. Result: should be stable if
Laser Cavities
HW P9.15
Result: should be stable if