Distance between lense and film to get a focused picture

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Homework Statement


Esperanza uses a 35-mm camera with a standard lens of focal length 50.0 mm to take a photo of her son Carlos, who is 1.3 m tall and standing 4.0 m away.

What must be the distance between the lens and the film to get a properly focused picture?
this answer is 50.6 mm.

What is the magnification of the image?
shouldnt this just be m=-q/p. i keep getting -.013 and its wrong

Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Kurdt
Staff Emeritus
Science Advisor
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There doesn't seem to be anything wrong with the calculation, could it just be you need to use more significant figures?
 

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