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OCR: d. With current technology, it is possible to make measurements on photographs to the nearest micron (10 6m). What is the smallest actual length whose image can be measured on the photograph of part (b)? (This is called the resolution of the photograph.) Solution: Let S be the smallest actual length in meters. Then 10-6 = 5 x 10-6 30 5 x 10-6 =10-6 and S = - m = 0.2m.