The front convex surface of a lens made for eyeglasses has, Ask an Expert

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The front, convex, surface of a lens made for eyeglasses has a radius of curvature of 12.4cm, and the back, concave, surface has a radious of curvature of 6.90cm. the index of refraction of the plastic lens material is 1.67

Part A Calculate the focal length of the lens.

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