Optical Physics Magnifying Glass HW problem

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Homework Statement



A child decides to use a THICK (not thin) lens as a magnifying glass to look at a bug such that her eye is focusing on an image that is located at her near point, which you can assume to be 25 cm from the childs eye). The thick lens consists of radii of curvature R_1 = 5.0 and R_2 = -3.0 cm which is a double convex lens. The separation between the vertices of the thick lens is 3.0 cm and the R2 radii part of the lens is the closer part to her eye and it's distance from the eye is 2.0 cm away. How far away is the bug from the nearest vertex of the lens?

Homework Equations



1/f = (n-1)(1/R1 - 1/R2 + (n-1)d/(nR1R2))


The Attempt at a Solution



so i found the focal length of the lens using this equation above... and got 1.28 cm,
how do I proceed?
 

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