OPTI502
Optical Design and Instrumentation I
John E. Greivenkamp
Final Exam – In Class
Page 1/14
Fall, 2009
Name_______________________
Closed book; closed notes.
The time limit is 2 hours.
Equation sheets are attached and can be removed.
Spare raytrace forms are also attached.
Use the back sides if required.
Do not use any prestored information or programs in your calculator.
Assume thin lenses in air if not specified.
If a method of solution is specified in the problem, it must be used.
You must show your work and/or method of solution in order to receive
credit or partial credit for your answer.
Distance Students: Please return the original exam only; do not scan/FAX/email an
additional copy.
1) (10 points)
Use two thin lenses in air to design a telephoto objective with a focal
length of 400 mm and a back focal distance of 200 mm.
The separation of the two lenses
must be 75 mm.
f1 = _________ mm
f2 = _________mm
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OPTI502
Optical Design and Instrumentation I
John E. Greivenkamp
Final Exam – In Class
Page 2/14
Fall, 2009
2)
(25 points)
The following diagram shows the design of a reverse telephoto objective
that is comprised of two thin lenses in air.
The system stop is located between the two
lenses.
The diameter of the stop is 10 mm.
The object is at infinity.
The maximum image size is +/ 20 mm.
Determine the following:
 Entrance pupil and exit pupil locations and sizes.
 System focal length.
 Angular field of view (in object space).
 Required diameters for the two lenses for the system to be unvignetted over the
specified maximum image size.
NOTE:
This problem is to be worked using raytrace methods only.
Gaussian
imaging methods may not be used for any portion of this problem.
Be sure to clearly
label your rays on the raytrace form.
Your answers must be entered below.
Be sure to provide details on the pages that follow
to indicate your method of solution (how did you get your answer: which ray was used,
analysis of ray data, etc.)
Entrance Pupil:
________ mm to the _______ of the first lens.
D
EP
= ________ mm
Exit Pupil:
________ mm to the _______ of the second lens.
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 Fall '08
 Greivenkamp
 Fnumber, John E. Greivenkamp, E. Greivenkamp Fall, OPTI502 Final Exam

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