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Working with a thins lens

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Work this problem using the thin-lens equation:
A diverging lens with focal length of 25 cm is used to view a postage stamp 50 cm from the lens. (a) How far from the lens does the stamp appear? (b) What is the magnification of the image? Work this problem by ray tracing?

I need to see each step and formula to solve this question. Please assume I know nothing because this would be the correct assumption. :)

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Solution shows the concepts along with all mathematical steps.

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The thin lens equation is

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

As we are using a diverging (concave) lens, ...

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