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## Homework Statement

An object is at distance s from a thin glass lens of focal length f. The lens is surrounded

by air. The image is at distance s' from the lens. Draw a graph of s' versus s. Explain

physically why the graph varies as it does.

## Homework Equations

I think I am supposed to use the thin lens equation of 1/s+1/s'=1/f.

## The Attempt at a Solution

For a fixed focal length, an increase in s causes the linearly proportional decrease in s'? As an object is moved farther away from the lens, the image also moves farther away.

I don't understand how this equation is independent from the case of a convex or concave lens.

Thanks for any help!