certain camera lens has a focal length of 127 mm. Its position can be adjusted to produce images when the lens is between 139 mm and 167 mm from the plane of the film. Over what range of object distances is the lens useful?
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A certain camera lens has a focal length of 127 mm. Its position can be adjusted to produce images when the lens is between 139 mm and 167 mm from the plane of the film. Over what range of object distances is the lens useful?
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