A double-pane window has a thin air space between two parallel panes of glass. If 90.0% of the incoming light is transmitted through a pane, and 10.0% is reflected, what percent of the light is transmitted through the second pane? See Fig. 19.8, which illustrates one incident ray of light and its unlimited reflections and transmissions through the two panes of glass.

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Transmitted Reflected Transmitted Incident ray Reflected Transmitted back, then reflected, and transmitted Reflected Fig. 19.8