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An image is magnified by 2.50, concave mirror confusion! wee

  1. Mar 14, 2006 #1
    Hello everyone< i think i'm on the right track but now i'm stuck.
    Here is the problem:
    A concave shaving mirror has a radius of curvature of 37.0 cm. It is positioned so that the (upright) image of a man's face is 2.50 times the size of the face. How far is the mirror from the face?

    Here is my work and drawing:

    I'm conufsed on how i'm suppose to find the object distance if i'm not giving the image distance.
  2. jcsd
  3. Mar 14, 2006 #2

    Chi Meson

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    Simultaneous equations. You have both of them. Two unkowns, di and do.
  4. Mar 14, 2006 #3
    like he said
    instead of using the hi-ho (:rofl:) relation find a relation between di and do.

    sub into your lens equation and you're all set.
  5. Mar 14, 2006 #4
    Awesome thanks alot guys worked great!
    11.1cm for object distance, o yes!
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