Optics question with radius of curvature

jack hunter
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Hi, I am a first time poster and I am completely lost with this question. Any help would be greatly appreciated

Filling the space between a contact lens and the cornea is a small quantity of liquid of refractive index of 1.336. Assuming the refractive index of the lens material is 1.490 find the effect on the power of the system of changing the radius of curvature of the posterior surface of the contact lens from 8 mm to 7 mm.
 
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have tried using the lens maker formula?
 
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