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## Homework Statement

Formulate an expression that gives the focal length of a corrective lens, to be used in conjunction with a fixed lens. You may assume that both lenses are on the same plane, i.e. that they are very close together. The corrective lens should allow an object at a specified distance from the lenses to produce an image at a specified distance from the lenses. You may assume that the corrective lens is “weaker” than the other lens, i.e. |f0| < |fc|.

## Homework Equations

Assuming they are both thin lenses:

Thin lens equation:

1/d

_{o}+1/d

_{i}= 1/f

(1/object distance + 1/image distance = 1/focal length)

## The Attempt at a Solution

So I have to derive this equation myself and I'm really lost on where to start. I tried to draw out a good picture of the situation but am still confused. Do I want to start with the thin lens equation as my starting out point?

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