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A lensmaker wants to make a magnifying glass from glass with n = 1.55 and with a focal length of 20.0 cm. If the two surfaces of the lens are to have equal radii, what should that radius be?
*24.58. SetUp: We apply the thin-lens equation:
Solve: Since f > 0 we choose R1 =R and R2 = −R, where R is the magnitude of the radius of curvature. Thus we have
Reflect: For identical convex surfaces, the relation between f and R is
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