Classical Electromagnetism by Jerrold Franklin

Author:Jerrold Franklin [Franklin, Jerrold]
Language: eng
Format: epub, pdf
Tags: gnv64
Publisher: Dover Publications, Inc.
Published: 2017-10-14T18:30:00+00:00

The transmission and reflection coefficients are then

From Eq. (10.122), we see that R will be zero if two conditions are satisfied:

which eliminates the second term in the numerator for R, and

which eliminates the first. We can use this last equation to relate the thickness of the coating to the wavelength of the incident light by

As an example of the effect of coating a glass lens with a thin layer, we have plotted in Fig. 10.11 the reflection coefficient as a function of incident wavelength for the case n1 = 1, n3 = 1.5. We have fixed the thickness of the coating so R = 0 when the wavelength is 5, 000Ǻ This keeps R well below the 4% reflection, which would occur with no coating, throughout the visible spectrum.

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