A contact lens is made of plastic with an index of refraction 1.50 . The lens has an outer radius of curvature of + 1.65 cm and an inner radius of curvature of + 5.85 cm. What is its focal length?

a. –4.60 cm
b. +1.53 cm
c. +2.57 cm
d. +4.60 cm
e. –2.57 cm


d

Physics & Space Science

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