# Quick question: magnification

1. Mar 31, 2007

### Aikenfan

1. The problem statement, all variables and given/known data
If someone wouldn't mind, would you please check my work, i would really appreciate it: I have only one chance to get the answer correct.

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Mar 31, 2007

### hage567

Yes, I think this is right.

There is a way you can check if your answer makes sense. Since you have found the object distance, 9.37cm, you can get the image distance, which is -3.59*9.37 = 33.64 cm (from your magnification equation). If you put both of those back into your lens equation so (1/f) = (1/9.37)+(-1/33.64) it should work out to your focal length that you were given in the question. If it doesn't, you have made a mistake somewhere. Try it. It's a useful way to check your work on tests.

3. Mar 31, 2007

### Aikenfan

It was correct! Thank you for the tip!