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The Focal Length of the Lens of a Simple Film 0.3 mm0.3 \mathrm {~mm}

question 99

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The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film be increased or decreased to change the focus from a
Person who is 25 m from the lens to one who is 4.0 m from the lens?


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