AST 3722C Spring 2008
Lab 3 solutions
Each question worth 2 points; you get 3 freebies
to make the total 25.
1. There are 8 eyepieces. The focal lengths are:
40, 32, 26, 20, 15, 12.4, 9.7, and 6.4 mm.
2. The magnifications for these 8 eyepieces are:
50, 62.5, 76.9, 100, 133.3, 161.3, 206.2, and 312.5.
Note that the biggest eyepieces has the smallest
magnification.
3. The fields of view of these eyepieces are:
53, 50, 41, 31, 24, 19, 15, and 10 arcmin.
Note that the biggest eyepiece has the biggest FOV.
4-7. You should have two sketches here for each object, for a total
of 8 sketches. Also you should have descriptions for all the objects.
You're not judged on artistic ability but your descriptions should
be detailed. More effort = Better grade.
8. - There was no number 8.
9. Convert the answers from #3 to radians and use Delta = 375000 km
in the formula. Depending on which two eyepieces you
picked, You should get linear distances of
5780 km, 5460 km, 4440 km, 3410 km,
2560 km, 2120 km, 1660 km, or 1090 km.
The smallest thing you see on the Moon in the highest-power eyepiece
depends a little bit on your visual acuity. Say you could see a