Lec27-1_LPN

Lec27-1_LPN - ture 27-1 ture Thin-Film Interference...

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cture 27- cture 27- 1 Thin-Film Interference Summary Path length difference: 2 l t ∆ ≈ (Assume near-normal incidence.) ray-one got a phase change of 180 o due to reflection from air to glass. the phase difference due to path length is: then total phase difference: φ = ’+180.
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cture 27- cture 27- 2 The air between the glass plates acts like a thin film. Since the thickness of the film changes over the radius of the plates, alternating bright and dark fringes form, when the plates are illuminated. Because of the curvature of the upper piece, the film thickness varies more rapidly at larger radius. Thus the fringe separation is smaller toward the outside . Newton’s Rings
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cture 27- 3 Two ( narrow ) slit Interference Upon reaching the screen C, the two wave interact to produce an interference pattern consisting of alternating bright and dark bands (or fringes), depending on their phase difference. Constructive vs. destructive interference According to Huygens’s principle, each slit acts like a wavelet. The the secondary wave fronts are cylindrical surfaces. Young’s double-slit experiment
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This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue.

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Lec27-1_LPN - ture 27-1 ture Thin-Film Interference...

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