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No glass is perfectly transparent. Mainly because of reflections, about 92% of light passes through an average sheet of clear windowpane.

No glass is perfectly transparent. Mainly because of reflections, about 92% of light passes through an average sheet of clear windowpane. The 8% loss is not noticed through a single sheet, but, through several sheets, the loss is apparent. How much light is transmitted by a "double-glazed" window (one with two sheets of glass)?

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