Concept explainers
Thin-film window coatings for energy conservation and comfort Thin-film coatings are applied to eyeglasses, computer screens, and automobile instrument panels to reduce glare and to binocular and camera lenses to increase the amount of light transmitted Thin-film coatings are also used to add color to architectural glass, to reduce surface friction, and to improve the energy efficiency of windows Consider this latter application.
Figure 24.30 shows that over
A 1.25 refractive index thin film on a 1.50 refractive index glass window is made to reflect infrared radiation of wavelength 1000 nm. What is the net reflective phase change of infrared radiation reflected off the front surface of the thin film relative to the radiation reflected off the back surface of the film and returning to the front?
a. Zero
b. 1/4 wavelength
c. 1/2 wavelength
d. None of these
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College Physics
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