Optical Instruments359(b) When the object distance is 33.0 cmp=, the corrective lens should produce parallel rays ( )q→∞. Then the implanted lens will focus the final image on the retina. From the thin lens equation, the required focal length is 33.0 cmfp==, and the power of this lens should be 11s0.330 m===P3.03 diopter+correctivef25.52When viewed from a distance of 50 meters, the angular length of a mouse (assumed to have an actual length of ≈) is 10 cm32.010−= ×0.10 mradians50 msrθ
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