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Concave mirror vs. Convex

  1. Oct 25, 2007 #1
    A spherical mirror is polished on both sides. When used as a convex mirror, the magnification
    is +1/4. What is the magnification when used as a concave mirror, the object remaining the
    same distance from the mirror?

    I started with:

    mconvex = 1/4
    mconcave = ?

    doconvex = doconcave
    hoconvex = hoconcave

    I wasn't sure about how to go from here...:

    m = hi/ho = -di/do

    mconvex = hiconvex/hoconvex = -diconvex/doconvex
    mconcave = hiconcave/hoconcave = -diconcave/doconcave

    1/4 = hiconvex/hoconvex
    hoconvex = 4hiconvex

    mconcave = hiconcave / hoconcave
    hoconcave = hiconcave / mconcave

    4hiconvex = hiconcave / mconcave

    mconcave = hiconcave / 4hiconvex

    I wasn't sure what to do from here or if I approached this correctly
  2. jcsd
  3. Oct 25, 2007 #2


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