PHY2049ch36A%284-16-10%29

PHY2049ch36A%284-16-10%29 - Wave Interference and...

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4/16/10 Tier 2 Centers. Paul Avery 1 PHY 2049: Chapter 36 1 Wave Interference and Diffraction: II PHY 2049 Physics 2 with Calculus PHY 2049: Chapter 35 2 Double Slit Interference ± Incident light ² Light waves strike 2 narrow slits close together ² Light goes through both slits, diffracts in all directions ± Interference ² At certain angles, waves constructively interfere ± brighter ² At other angles, waves destructively interfere ± darker Light waves Screen Diffracted light Interference Slits
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4/16/10 Tier 2 Centers. Paul Avery 2 PHY 2049: Chapter 35 3 Basic Requirements for Two Slit Setup ± Light beam strikes normal to slits ± Light beam illuminates both slits equally ± Light beam is in phase at both slits: coherent ² Young used small slit in front of 2 slits to get coherence ² Modern versions use laser for coherence (much brighter) PHY 2049: Chapter 35 4 Two Slit Analysis ± d Path difference = d sin ±
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4/16/10 Tier 2 Centers. Paul Avery 3 PHY 2049: Chapter 35 5 Double Slit Intensity Pattern on Screen PHY 2049: Chapter 35 6 Example of Double Slit Max and Min
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4/16/10 Tier 2 Centers. Paul Avery 4 PHY 2049: Chapter 35 7 Example 1: d = 5 ± m sin ± max ± max sin ± min ± min 0 0 0 ±0.1 ±5.7 ±1 ±0.2 ±11.5 ±0.3 ±17.5 ±2 ±0.4 ±23.6 ±0.5 ±30 ±3 ±0.6 ±36.9 ±0.7 ±44.4 ±4 ±0.8 ±53.1 ±0.9 ±64.2 ±5 ±1.0 ±90 ±1.1 -- PHY 2049: Chapter 35 8 Intensity vs Angle for d = 5 ±
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4/16/10 Tier 2 Centers. Paul Avery 5 PHY 2049: Chapter 35 9 Example 2: d = 2.0 μ m, ± = 550 nm ± How many bright fringes? Where are they? ± m can equal 0, ±1, ±2, ±3
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This note was uploaded on 04/23/2010 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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PHY2049ch36A%284-16-10%29 - Wave Interference and...

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