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

1. Mar 5, 2009

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?

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. Mar 6, 2009

### Carid

Why not trace some rays from the head of the organist to the edges of the mirror and across to the opposite wall?

3. Mar 6, 2009

### Redbelly98

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