Question: A 35 mm camera has a rectangular array of CCDs (light sensors) that is 24 mm by 36 mm. It is used to take a picture of a person 172 cm tall so that the image just fills the height (24 mm) of the CCD array.
Part A: How far should the person stand from the camera if the focal length of the lens is 56 mm?
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I want help to find how far the person stands from the camera if the focal length of the lens is 56 mm.