(Answered) A lens is made of glass having an index of refraction of 15

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A lens is made of glass having an index of refraction of 1.5. One side of the lens is flat, and the other convex with a radius of curvature of 18 cm.

(a) Find the focal length of the lens.

(b) If an object is placed 36 cm in front of the lens, what is the image distance i?

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