# Lens' and Magnification

1. Oct 28, 2009

### luap12

1.An object is placed to the left of a lens, and a real image is formed to the right of the lens. The image is inverted relative to the object and is one-half the size of the object. The distance between the object and the image is 102.0 cm.

(a1) How far from the lens is the object?

2.m=-(di/do)

3. with the equation above I thought it was just -1/2=120/do and solving for do gives -204 cm, but this answer is wrong, and so is 204. I know that m is negative because the image is inverted. Not sure if my logic is right or not, we haven't covered this yet in class but it is still on the homework.

2. Oct 28, 2009

### Gear300

M = -q/p, in which q is the distance from the lens to the image and p is the distance from the lens to the object. The 102cm given is the distance between the object and image.

3. Oct 28, 2009

### luap12

That worked, thanks. I had the wrong idea of what the terms actually meant.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook