Recent content by flicker128

crzcrcketer89, you can't just use random values, and 100 cm is the distance between the LIGHT BULB and the SCREEN. The LENS goes in between, so p can't equal 100.

Use substitution taking the above two equations. When you solve one variable (p or q), you can use them vice versa to find your other value, since you can do either p=100-q or q=100-p. Put these substitutions into the thin lens equation and voila. I think that's how you do it.