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

question 99

Multiple Choice

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?

• A) \(0.3 \mathrm {~mm}\)
• B) \(0.5 \mathrm {~mm}\)
• C) \(0.4 \mathrm {~mm}\)
• D) \(0.2 \mathrm {~mm}\)
• E) \(0.7 \mathrm {~mm}\)

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