No glass is perfectly transparent. Mainly because of reflections, about 90% of light passes through an average sheet of clear windowpane. The 10% loss is not noticed with a single sheet, but with several sheets it is apparent. How much light is transmitted by three sheets?
72.9%
65.6
sorry I thought that it said four sheets
To determine how much light is transmitted by three sheets of glass, we need to consider the light transmission percentage provided.
The information states that an average sheet of clear windowpane allows 90% of light to pass through, meaning there is a 10% loss. This means that for every 100 units of light that hit the windowpane, 90 units of light pass through while 10 units are lost.
If we stack three sheets of glass on top of each other, we can calculate the total percentage of light transmitted as follows:
- The first sheet transmits 90% of the light, resulting in 90 units of light passing through and 10 units being lost.
- The second sheet also transmits 90% of the light that made it through the first sheet. So, from the 90 units of light that made it through the first sheet, 90% is transmitted (81 units), and 10% is lost (9 units).
- Finally, the third sheet transmits 90% of the light that made it through the second sheet. From the 81 units of light that made it through the second sheet, 90% is transmitted (72.9 units), and 10% is lost (8.1 units).
Therefore, when three sheets of glass are stacked on top of each other, a total of 72.9 units of light are transmitted, while 27.1 units are lost.
So, approximately 72.9% of the light is transmitted through three sheets of glass.