Finding object distance with only the focal length and magnification?

  • Thread starter Kristy92
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  • #1
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A magnifying glass has a diverging lens with a 13.0 cm focal length. At what distance from a toothpick should you hold this lens to form an image with a magnification of +5.00?

I simply have no idea what to do. I tied moving around the equations to make them work, but I can't figure it out.

Please help & thank you!
 

Answers and Replies

  • #2
supratim1
Gold Member
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Hi Kristy, Welcome to Physics Forums!


you should have tried a bit more.

magnification = v/u = +5.

also, 1/f = 1/v - 1/u. f = -13cm for diverging lens.

solve.
 

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