Lec-28 - Previous Lecture one slit, two slits diffraction...

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Unformatted text preview: Previous Lecture one slit, two slits diffraction pattern from one slit diffraction pattern from circular aperture p. Today Resolution of optical instruments Polarization Information about the final p. Diffraction by a circular aperture Image of a point source (wavelength ) p. Resolution of Optical Instruments p. Image of a Single Star Image of a point source (wavelength ) p. Two Closely Spaced Stars p. A Just-resolved Binary Star Center of image for first star. Center of image for second star. p. Problem If two binary stars are separated by 1.5 arcseconds, what is the minimum diameter (D) objective lens a telescope must have in order to resolve them? p. Problem If two binary stars are separated by 1.5 arcseconds, what is the minimum diameter (D) objective lens a telescope must have in order to resolve them? Solution: Use the Rayleigh criterion: 1.22 = D 1.22 D= p. Resolving Binary Stars Image of 1.5 arcsecond binary star 60 mm 102 mm 200 mm Diameter of objective lens p. Polarization This wave is polarized in the y direction. (Fig. 32-14) p. 1 Polarization Effects I0 I0 /2 Figures 36-35, 36-37 I0 I0 /2 I0 /4 I0 /8 p. 1 Example Two polarizers are oriented at 34.0 to one another. Light polarized at a 17.0 angle to each polarizer passes through both. What reduction in intensity takes place? p. 1 Quantum MechanicsHighlights Particles the size of atoms or electrons must be described using waves. We find the wave by solving Schroedinger's Equation. Everything you have learned about waves is valid in quantum mechanics. Some of what you have learned about particles is not true in quantum mechanics. It's hard to tell what's a particle and what's a wave. For more information, take Physics 31. p. 1 Final Exam Sat., Dec. 15, 2007, noon3 pm in PA 101 (extra time students take the entire exam in LL221) Covers entire semester: 50% E&M 50% waves & optics Equation sheet, notes on optics supplied on exam A question or two from material covered only in lecture Study guide and review questions on optics are posted on the class web site Saturday, Dec. 8, 9:20 a.m. and 10:45 a.m.: RCS in LL270 or LL404 Monday, Dec. 10: RCS for recitation p. 1 ...
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