You are given three parallel panes of glass. Each pane will transmit 70%,
reflect 20%, and absorb 10% of the light that falls on it. If a light source
is placed on one side of the three panes, what is the total percentage of
light that passes through to the other side?
For example, if a beam of light follows the path in Figure 1, .7 x .7 x .7
of the light would be transmitted, but if a beam of light followed the
path shown in Figure 2, .7 x .7 x .2 x .2 x .7 of the light would be
The problem is to find the TOTAL amount of light transmitted.