The focal length of the lens of a simple film camera is 400, Physics

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The focal length of the lens of a simple film camera is 400

Problem: 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?

I don't know how to work the above problem. Please show step by step solution. THANKS!

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Physics: The focal length of the lens of a simple film camera is 400

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Physics: The focal length of the lens of a simple film camera is 400

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