Lecture-24-04-10-08

Lecture-08 - 1 Lecture-24 Physical Optics – Wave-like effects Demonstration • Interference Two Huygens wavelets overlap and add to create

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Unformatted text preview: 1 Lecture-24 Physical Optics – Wave-like effects Demonstration • Interference Two Huygens wavelets overlap and add to create spatial modulation of intensity. Interference Question: How does it work? Note: Light detectors including eyes respond to intensity. 2 θ π λ δ sin 2 d difference path difference path = × ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ = d sin θ • Interference Condition Phase difference between two rays at screen: Constructive if Destructive if where m=0, ± 1, ± 2, … • Interference in Thin Films Note n air < n oil < n water . Beam 1 suffers phase shift by π at air-oil, and beam 2 has phase shift by π at oil- water. Then, beam 1 and beam 2 interfere constructively if 2 n oil d = m λ . Air Wedge: λ θ m d = sin λ θ ) 2 / 1 ( sin + = m d 1 2 d 3 • Michelson Interferometer Constructive fringes if displacement d of M 1 satisfies 2 d = m λ . • Mach-Zehnder Interferometer Flow over a step in a rectangular pipe 4 • Intensity in Double-Slit Interference Interference fringes result...
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This note was uploaded on 04/13/2008 for the course PHYSIC 2 taught by Professor Kim during the Spring '08 term at Lehigh University .

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Lecture-08 - 1 Lecture-24 Physical Optics – Wave-like effects Demonstration • Interference Two Huygens wavelets overlap and add to create

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