# have hey can you put this on the screen this is

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Unformatted text preview: on it in physics 211 and still Anyway have yet to get on it for physics 212. Throw me a bone!!! have Hey can you put this on the screen! This is probably my last chance! Hey Thanks! Aww my second physics class, and I have still never made it onto the board :( board THIS IS MY LAST CHANCE TO GET ONTO THE SCREEN, HELLO THIS WORLD! WORLD! I can't think of anything clever to put. Put this up anyways. Dear Professor, This is the last prelecture/preflight i ever have to do. Dear Please post this!!!!! P h y s ic s 2 1 2 Le c tu re 2 8 , S lid e 5 Please S > 2f Exe c utive S um m a ry – Mirro rs & Le ns e s : real f > 0 2f > S > f f > S > 0 inverted smaller real real inverted bigger c o nc ave ( c o nve r g ing ) c o nve r g ing f S′ M =− S 111 += S S′ f virtual virtual upright bigger f f < 0 S > 0 virtual upright smaller c o nve x ( d ive r g ing ) f d ive r g ing f Physics 212 Lecture 28, Slide 6 Physics 212 Lecture 28, Slide It’s always the same: 111 += S S′ f S′ M =− S You just have to keep the signs straight: You just have to keep the signs straight: s’ is positive for a real image f is positive when it can produce a real image Lens sign conventions S: positive if object is “upstream” of lens S’ : positive if image is “downstream” of lens f: positive if converging lens Mirrors sign conventions S: positive if object is “upstream” of mirror S’ : positive if image is “upstream” of mirror f: positive if converging mirror (concave) Physics 212 Lecture 28, Slide 7 Physics 212 Lecture 28, Slide System of Lenses • Trace rays through lenses, beginning with most upstream lens Image from first lens Becomes object for second lens Physics 212 Lecture 28, Slide 8 Physics 212 Lecture 28, Slide System of Lenses • Virtual Objects are Possible !! Object Distance is Negative !! Image from first lens Becomes object for second lens Physics 212 Lecture 28, Slide 9 Physics 212 Lecture 28, Slide A parallel laser beam of width w1 is incident on a two lens sys...
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## This note was uploaded on 02/18/2013 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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