What is the focal length of a plano-convex lens with an index of refraction of 1.6 and a radius of curvature of the convex side of 4 m? What focal length lens would form an image 40 cm behind it if an object was 120 cm in front of it?
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Plugging in the values R = 4 m and n = 1.6: f = 4 / (1.6 - 1) f = 4 / 0.6 f = 6.67 m Therefore, the focal length of the plano-convex lens is 6.67 m. Show more…
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