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499. assignment (lens diopter)

A prescription for a corrective lens calls for + 3.70D . The lensmaker grinds the lens from a "blank" with n = 1.56 and a preformed convex front surface of radius of curvature of 35.0cm .

 

What should be the radius of curvature of the other surface?

 

I keep getting 25.7 cm idk what im doing wrong

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