Hi i have started the problem but i can\'t seem to get the secondpart on over al

Question

Hi i have started the problem but i can't seem to get the secondpart on over all magnification, i know the equation for overallmagnification is -s'/s but its not coming out right. Pleasehelp!!
An object is 1.6 m to the left of alens of focal length 0.86 m. A secondlens of focal length -3.1 mis 0.36 m to the right of the firstlens. Find the distance between the object and the final imageformed by the second lens.
4.86422 M is where the final imageis.
What is the overallmagnification???? please help!
Thanks!
An object is 1.6 m to the left of alens of focal length 0.86 m. A secondlens of focal length -3.1 mis 0.36 m to the right of the firstlens. Find the distance between the object and the final imageformed by the second lens.
4.86422 M is where the final imageis.
What is the overallmagnification???? please help!
Thanks!

Explanation / Answer

My problem is how to get from that to the total mag. of the object.

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