63. IE A plastic convex meniscus (Figure 23.16) contact lens is made of plastic with an...

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63. IE •• A plastic convex meniscus (Figure 23.16) contact lens is made of plastic with an index of refraction of 1.55. The lens has a front radius of 2.50 cm and a back radius of 3.00 cm.

(a) The signs of R1 and R2 are

(1) +, +, (2) +, −, (3) −, +, (4) −, −. Explain.

(b) What is the focal length of the lens?

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