Lecture 32. Selected Topics for Review

Lecture 32. Selected Topics for Review

A. Homework 6. Questions

B. Brightness & Size vs. Distance
dist 1 dist 2 CBL/FDS* dist ratio size ratio brightness ratio
2 4 FDS 2 1/2 1/4
3 1 CBL 1/3 3 9
16 ____ CBL ____ ____ 16
16 ____ CBL ____ 16 ____
2 ____ FDS ____ ____ 1/25
2 ____ FDS ____ 1/25 ____
2 5 ____ 5/2=2.5 2/5=1/(2.5) 4/25=1/(6.25)
3 2 ____ ____ ____ ____
* CBL = closer & brighter & larger;
FDS = farther & dimmer & smaller