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**Simple Microscope Problem that I have been STUCK on!!!**

**1. Homework Statement**

How far from a lens of focal length 50 mm must the object be placed if it is to form a virtual image magnified in size by a factor of 3?

**2. Homework Equations**

**3. The Attempt at a Solution**

I thought I could us the equation...

M = s'-f/f to get s' and then use...

1/f = 1/s + 1/s' to get the object distance

but I am not coming up with the right answer??