OPTI-502
Optical Design and Instrumentation I
John E. Greivenkamp
Homework Set 11
Fall, 2010
Assigned:
11/9/10
Lecture 23
Due:
11/16/10
Lecture 24
11-1)
Consider the following optical system comprised of two thin lenses in air:
The object is placed at the front focal point of the first lens and is imaged to the rear focal point
of the second lens.
a) Use the marginal ray angles u and u' to determine the magnification.
b) What is the focal length or power of the system.
c)
You should have found that the magnification of the system at these conjugates is
independent of the lens separation t, but the focal length is a function of the separation t.
Explain
this result in terms of the Gaussian object and image distances z and z'.
11-2) A 5x Keplerian telescope has a 200 mm focal length objective.
The objective lens serves
as the system stop and has a diameter of 40 mm.
a)
What is the required eye lens diameter for the telescope to have an unvignetted field of
view of +/- 2 degrees?
b)
Convert the telescope into a doubly telecentric system.
Where is the stop location?
c)
Two objects are located 400 mm and 100 mm to the left of the objective lens.
Where are
the respective image planes (relative to the second lens)?
f
2
-f
1
t
f
1
f
2
F
1
F'
2
u
u'

This
** preview**
has intentionally

**sections.**

*blurred***to view the full version.**

*Sign up*