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What is the width of a wall seen from an opposing mirror?

  1. Mar 5, 2009 #1
    1. The problem statement, all variables and given/known data

    In a church choir loft, two parallel walls are
    4.98 m apart. The singers stand against the
    north wall. The organist faces the south wall,
    sitting 0.967 m away from it. So that she can
    see the choir, a flat mirror 0.855 m wide is
    mounted in the south wall, straight in front of
    the organist.
    What width of the north wall can she see?
    Answer in units of m.

    2. Relevant equations
    I'm not exactly sure, but I think snells law is incorporated somehow.

    3. The attempt at a solution
    I drew a diagram showing how the rays would bounce off the north wall into the southwall and I do see where some triangles are formed, other than that i'm kinda lost...
  2. jcsd
  3. Mar 6, 2009 #2
    Why not trace some rays from the head of the organist to the edges of the mirror and across to the opposite wall?
  4. Mar 6, 2009 #3


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Mmmm, not quite. How about the Law of Reflection?
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