- #1
tensor0910
Gold Member
- 46
- 14
Homework Statement
Im having trouble knowing/remembering when my di and do should be positive or negative. Does anyone have any tips/advice for this?[/B]
Homework Equations
1/f = 1/di + 1/do, hi/ho = di/do[/B]
The Attempt at a Solution
No solution. Just a question.[/B]