Macmillan Learning Reciprocal of image distance, m-1 a 3 N 1 3 4 2 Reciprocal of object distance, m-1 O 0.25 m. O-1.0 m. 1.0 m. 5 The graph shows the reciprocal of the image distance plotted against the reciprocal of the object distance for a certain lens. From this graph it can be seen that this lens has a focal length of O 0.20 m. 4.0 m.
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