Single Slit Diffraction and Resolving Power

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Single Slit Diffraction and Resolving Power

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The University of Vermont
Phys 012 - Elementary Physics
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Lecture 29 Outline of Last Lecture I. Single Thin Film Interference a. Path length difference + phase difference = condition for constructive or destructive interference b. Problem: Light of wavelength 469 nm enters a layer of gasoline (ng = 1.4) on top of a layer of water (nw = 1.33) at an angle. What is the minimum non-zero value of t so the light coming from gasoline is bright? i. 2t + λg/2 = λg/2, 3λg/2, 5λg/2, etc. ii. t = m λg/2 = [(1)λair]/[2ng] = 168 nm II. Double Thin Film Interference a. Ray 2 travels extra distance of ~2t and undergoes 2 phase changes. b. For constructive interference: 2t + λw/2 + = λw, 2 λw, 3 λw, etc. III. Diffraction – Single Slit Physics 012 1st Edition

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