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A flat hollow lens has a spherical surface with 23.5 cm as the absolute value of the radius of curvature and 42. cm as the

A flat hollow lens has a spherical surface with 23.5 cm as the absolute value of the radius of curvature and 42. cm as the absolute value of its focal length. Calculate the (relative) refractive index of the lens material. Select the correct answer from the following list:

a) 2.57

b) 1.62

c) 1.56

d) .787e-1

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