Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 24 - The Wave Nature of Light - Search and Learn - Page 712: 7

Answer

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Work Step by Step

We know that each surface of the glass is reflecting about $4\%$ of the incident light on it. This means that the transmitted light from the first surface is about $96\%$ and the reflected light from the second surface is $4\%$ of the $96\%$ which is about $3.84\%$. Thus, the net transmitted light is $$100\%-4\%-3.84\%=\bf 92.16\%$$ This means that for each lens we have only $92\%$ of light transmitted to the person's eye. Now if we used many lenses, we will lose a lot of light by reflection which, in cameras, degrades the image. And the best solution for that is coating the lens with some material, fil, that decreases the reflected light from $4\%$ to $1\%$ by a thickness that makes the reflected light interferes destructively. This means that the transmitted light will be increased from $96\%$ to $99\%$ for one surface; this gave us a total reflected light percentage of $2\%$ off one lens.
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