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QUESTION
A thick lens has radii R1 and R2 such that R1R2 with both vertices to the left of their respective center of curvature.
A thick lens has radii R1 and R2 such that R1>R2 with both vertices to the left of their respective center of curvature. How thick must the lens be for its focal length to be infinite if it is made of glass with refractive index n?
