rev24sp09 - April 16, 2009 PHY 2054 Discussion Spring 09...

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April 16, 2009 PHY 2054 Discussion Spring ‘09 Conceptual Review: Chapter 24 A . Conditions for Interference 1. Two important quantities to analyze interference: 2. Describe the condition for the phase change upon reflection. 3. In Young’s double slit experiment, by what factor does the distance between adjacent bright and dark fringes change if the distance between the screen and slits is tripled? C. Interference in Thin Films 1. A beam of light w/ a wavelength of 600 nm passes through two closely spaced glass plates. What is the minimum plate separation for the reflected beam/the transmitted beam to be bright? 2. A pair of glass plates are separated 3μm spacer along one end. The top plate is illuminated by a light beam of wavelength 500 nm. How many dark bands are observed on the top plate? C. Diffraction 1. A blue light and a red light are incident on a single slit. Is the central maximum wider for the blue light or red light? 2. A wavelength of 500 nm is sent through a diffraction grating. At what angle does the 2
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rev24sp09 - April 16, 2009 PHY 2054 Discussion Spring 09...

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