How far from a 53.6 mm focal-length lens must an object be, Ask an Expert

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Q. An elevator has a mass of 1100 kg. Assume it accelerates upward at .45 m/s2. What is the force acting on the elevators support cable?

(a) How far from a 53.6 mm focal-length lens must an object be placed if its image is to be magnified 2.12X and be real?

(b) What if the image is to be virtual and magnified 2.12X?

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