Transcription of Chapter 14 Interference and Diffraction
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Chapter 14 Interference and Diffraction
Chapter 14 Interference and Diffraction Superposition of Young s Double-Slit Example : Double-Slit Intensity Example : Intensity of Three-Slit Single-Slit Example : Single-Slit Intensity of Single-Slit Intensity of Double-Slit Diffraction Diffraction Appendix: Computing the Total Electric Solved Double-Slit Phase Constructive Intensity in Double-Slit Second-Order Bright Intensity in Double-Slit Conceptual Additional Double-Slit Interference - Diffraction Three-Slit Intensity of Double-Slit Secondary Interference - Diffraction 14-1 Interference and Diffraction Superposition of Waves Consider a region in space where two or more waves pass through at the same time. According to the superposition principle, the net displacement is simply given by the vector or the algebraic sum of the individual displacements.
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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