Chapter 14 Interference and Diffraction

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Chapter 14. Interference and Diffraction Superposition of Waves ........................................ ........................................ .... 14-2. Young's Double-Slit Experiment ........................................ ............................. 14-4. Example : Double-Slit 14-7. Intensity Distribution ........................................ ........................................ ........ 14-8. Example : Intensity of Three-Slit Interference ........................................ .... 14-11. 14-13. Single-Slit 14-13. Example : Single-Slit Diffraction ........................................ ........................ 14-15. Intensity of Single-Slit Diffraction .

22 rr21−=()r2+r1(r2−r1)=2drsinθ (14.2.3) In the limit L, i.e., the distance to the screen is much greater than the distance between the slits, the sum of and may be approximated by d r1 r2 rr12+ ≈2r, and the path difference becomes δ=rr21−≈dsinθ (14.2.4) In this limit, the two rays and are essentially treated as being parallel (see Figure

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