1. The prescription of a Cooke Triplet is
Radius
Thickness
Glass
32.25
6
LASFN31
188.25
8.1
-144.5
1.0
SF57
28.72
17.9
139.6
2.5
LASFN31
-88.0
The best method to find the refractive index of the glasses is to use OSLO. The glass can
be found in the Schott catalog.
a. Find the effective focal length and principle planes for a Cooke Triplet. Use a
wavelength near 488 nm and use the paraxial approximation. Use the thin
lens approximation.
b. Find the effective focal length and principle planes for a Cooke Triplet. Use a
wavelength near 488 nm and use the paraxial approximation. Do not use the
thin lens approximation
c. Use OSLO to calculate the actual effective focal length.
d. Use OSLO to estimate the location of the actual P’ planes. Do this by printing
the ray trace and using a ruler to measure the distance to the principal planes.
Use an entrance beam radius of 10. You do not need to calculate the P plane.
2. If the Canon PowerShot G7
(http://www.dpreview.com/reviews/specs/Canon/canon_g7.asp) is used to take a
picture what is the depth of field for the following situations?
a. Maximum aperture size, minimum object distance (Normal focus range)
b. Minimum aperture size, minimum object distance (Normal focus range)
c. Maximum aperture size, object distance 10m
3. Problem 5.12
4. Problem 5.13