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Chapter 27: Q7CQ (page 994)
Does Huygens’s principle apply to all types of waves?
Yes, Huygens' principle holds true for all types of waves.
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A diffraction grating has lines per centimeter. At what angle will the first-order maximum be for -wavelength green light?
An opal such as that shown in Figure acts like a reflection grating with rows separated by about If the opal is illuminated normally, (a) at what angle will red light be seen, and (b) at what angle will blue light be seen?
Young’s double slit experiment breaks a single light beam into two sources. Would the same pattern be obtained for two independent sources of light, such as the headlights of a distant car? Explain.
(a) Find the maximum number of lines per centimeter a diffraction grating can have and produce a maximum for the smallest wavelength of visible light. (b) Would such a grating be useful for ultraviolet spectra? (c) For infrared spectra?
An inventor notices that a soap bubble is dark at its thinnest and realizes that destructive interference is taking place for all wavelengths. How could she use this knowledge to make a non-reflective coating for lenses that is effective at all wavelengths? That is, what limits would there be on the index of refraction and thickness of the coating? How might this be impractical?
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