AST-L3-ch3__3

AST-L3-ch3__3 - ASTStars and Galaxies 1002 Planets, Prof....

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1 1 AST 1002 Planets, Stars and Galaxies Section 1 -- MW 3:35-4:50 pm; Section 2 -- MW 5:15-6:30 pm Prof. David Lind, FSU Physics Today’s Lecture: “Light and Telescopes” Planets, Stars and Galaxies Section 1 -- MW 3:35-4:50 pm; Section 2 -- MW 5:15-6:30 pm Prof. David Lind, FSU Physics Today’s Lecture: purpose & goals Understand the Geometrical Optics of lenses and mirrors -- refraction, reflection Understand the Three Powers of a Telescope -- light gathering, -- resolution, -- magnification Light and its Interaction with the Atmosphere -- diffraction, -- light pollution, -- “seeing” “Light and Telescopes” Telescopes - Early Milestones “…On the 7th day of January…. .1610,….when I was 1608 – Hans Lippershey (Dut c h) First telescope patent 1609 – first observations of celestial objects by Galileo Galilei Craters on the Moon Sunspots Phases of Venus Galileo’s discovery of the phases of Venus convinced him that Venus orbits the Sun and not the Earth Moons of Jupiter 1610 – wrote 17 th century best-seller: Si dereu s Nun i u ( The Starry Messenger )
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2 2 Refraction of Light Refractive telescopes use lenses to focus light and form an image. Refraction depends on the bending of light as it passes through a transparent medium . the precise shape (" figure ") of both surfaces of the lens are important, ideally a parabolic curve accurate to within ~1/10 μ m. the density, uniformity, transparency, and composition of the lens are all critical. the largest refracting telescope is 1.04-meter telescope at Yerkes Observatory , Wisc.) Glass sags under its own weight , and with changes in temperature , and thus distorts when moved. Large optical lens
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This note was uploaded on 10/13/2011 for the course AST 1002 taught by Professor Gerstein during the Spring '08 term at FSU.

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AST-L3-ch3__3 - ASTStars and Galaxies 1002 Planets, Prof....

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