Lecture%2042%202220%20Spring%202009

Lecture%2042%202220%20Spring%202009 - Reminders and...

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1 Reminders and Announcements • HW 24 is optional (extra credit) and is due Friday • Friday is (optional) review Friday is (optional) review • Comprehensive Final Exam is Monday at 4 pm • Help Room Hours (Physics 117): – W 3-6:30, R 4:30-8, F 2-6 Resolution • The images are far enough apart to keep their central maxima from overlapping The angle subtended by the The angle subtended by the sources at the slit is large enough for the diffraction patterns to be distinguishable • The images are resolved Circular Apertures • The diffraction pattern of a circular aperture consists of a central bright disk surrounded by progressively fainter bright and dark rings • The limiting angle of resolution of the circular aperture is D is the diameter of the aperture min 122 . λ θ D = Circular Apertures, Well Resolved • The sources are far apart • The images are well ld resolved • The solid curves are the individual diffraction patterns • The dashed lines are the resultant pattern Circular Apertures, Just Resolved • The sources are separated by an angle that satisfies Rayleigh’s criterion The images are just The images are just resolved • The solid curves are the individual diffraction patterns • The dashed lines are the resultant pattern Circular Apertures, Not Resolved • The sources are close together • The images are l unresolved • The solid curves are the individual diffraction patterns • The dashed lines are the resultant pattern
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2 Example Example Resolution, Example • Pluto and its moon, Charon • Left: Earth-based telescope is blurred • Right: Hubble Space Telescope clearly resolves the two objects Suppose you are observing a binary star with a telescope and are having difficulty resolving the two stars. You decide to use a colored filter to maximize the resolution. (A filter of a given color transmits only that color of light.) What color filter should you choose?
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Lecture%2042%202220%20Spring%202009 - Reminders and...

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