Focal length of lense

  • Thread starter goWlfpack
  • Start date
  • #1
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Homework Statement


The nickel's image in the figure below has twice the diameter of the nickel when the lens is 2.90 cm from the nickel. Determine the focal length of the lens.


Homework Equations



M = h'/h = - (p/q)

The Attempt at a Solution


i dont really know how to start this one... eek
 

Answers and Replies

  • #2
Redbelly98
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There is a well-known equation for lenses, try that one.

Hint: it has a "1/f" in it.
 

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