Mirrors and lenses. This question is kicking my @ss?

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Pablo

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Suppose you have a converging lens with focal length 32.0 cm and you place an object 45.91 cm from the lens. What is the location of the image?
105.6 cm
I got this one already.

What is the magnification of the image?
-2.30
I think I got this one too.

If a diverging lens of focal length -80.0 cm is then placed 27.0 cm from the first lens on the opposite side of the lens from the object, what is the location of the new image?


What is the magnification due to the two-lens system?

The last 2 I don't know how to do. =(
 
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