The Focal Length of the Lens of a Simple Camera

question 28

Multiple Choice

The focal length of the lens of a simple camera is 40.0 mm. How far must the lens be moved to change the focus of the camera from a person 25 m away to one that is 4.0 m away?

• A) 0.2 mm
• B) 0.3 mm
• C) 0.4 mm
• D) 0.5 mm
• E) 0.7 mm

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