A double convex lens has faces of radii 18.0 cm and 20.0 cm. When an object is placed 24.0 cm from the lens, a real image is formed 32.0 cm from the lens. Determine:
(a) the focal length of the lens.
(b) the index of refraction of the lens material.
(a) 13.7 cm
(b) n = 1.69
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