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Optics question

Hello,I dont know how to do this short exercise,I mean it does not make any sense.The only thing i know  is that the answer is 3.3cm  but i cant do the procudure finding the same result.This is the exercise:
A concave mirror makes a 3 cm image of a 6 cm object when the object is placed 10 cm from the mirror. What is the focal length of the mirror?

It really would help me if you lend me a hand on this.
many thanks

Daniel posted

Answer

15496257000686727171130204739555.jpg

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