QuestionsCh35

# QuestionsCh35 - CHAPTER 35: Diffraction and Polarization...

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CHAPTER 35: Diffraction and Polarization Answers to Questions 1. Radio waves have a much longer wavelength than visible light and will diffract around normal-sized objects (like hills). The wavelengths of visible light are very small and will not diffract around normal-sized objects. 2. You see a pattern of dark and bright lines parallel to your fingertips in the narrow opening between your fingers. 3. Light from all points of an extended source produces diffraction patterns, and these many different diffraction patterns overlap and wash out each other so that no distinct pattern can be easily seen. When using white light, the diffraction patterns of the different wavelengths will overlap because the locations of the fringes depend on wavelength. Monochromatic light will produce a more distinct diffraction pattern. 4. ( a ) If the slit width is increased, the diffraction pattern will become more compact. ( b ) If the wavelength of the light is increased, the diffraction pattern will spread out. 5. ( a ) A slit width of 50 nm would produce a central maximum so spread out that it would cover the entire width of the screen. No minimum (and therefore no diffraction pattern) will be seen. The different wavelengths will all overlap, so the light on the screen will be white. It will also be dim, compared to the source, because it is spread out. ( b ) For the 50,000 nm slit, the central maximum will be very narrow, about a degree in width for the blue end of the spectrum and about a degree and a half for the red. The diffraction pattern will not be distinct, because most of the intensity will be in the small central maximum and the fringes for the different wavelengths of white light will not coincide.

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## This note was uploaded on 03/22/2009 for the course PHY 54L taught by Professor Thomas during the Spring '09 term at Duke.

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QuestionsCh35 - CHAPTER 35: Diffraction and Polarization...

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