Lect28 - Physics 212 Lecture 28 Slide 1 Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 28, Slide 1 Physics 212 Lecture 28 Optical Devices Music Who is the Artist? A) Pete Fountain B) Marcus Roberts & Victor Goines C) New Orleans Nightcrawlers D) Anat Cohen E) Tom McDermott & Evan Christopher Theme of Week Threadhead Records Artists who played at Lagniappe stage, Jazzfest 2011 Anat Cohen, clarinetist supreme, also played last Jazzfest with Tom McDermott and others Physics 212 Lecture 28, Slide 3 Your Comments 05 “Some extra time on systems of lenses would be appreciated. It can be difficult to keep track of everything, especially as more and more lenses are added.” LENGTHY DEMO / CALCULATION to finish lecture “Very confusing for how easy lenses have been” “All the stuff about nearsightedness and farsightedness was very confusing. But that was nothing compared to the confusion I felt while watching the stuff about angular magnification.. Please help!” We will do a brief summary and have some demos “Please have demos” “This is cool! now I know how my contacts and glasses work. But can you explain how they make these very important lenses so very very little?” “My girlfriend told me my glasses made me nerdy. I explained to her the cool physics behind them. She then reiterated how nerdy I was.” Physics 212 Lecture 28, Slide 4 Your Comments I have lost all faith in my posts ever ending up on a powerpoint. Physics fails me again.. Anyway to get on the big board? I didn't get on it in physics 211 and still have yet to get on it for physics 212. Throw me a bone!!! Hey can you put this on the screen! This is probably my last chance! Thanks! Aww my second physics class, and I have still never made it onto the board :( THIS IS MY LAST CHANCE TO GET ONTO THE SCREEN, HELLO 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. Please post this!!!!! Physics 212 Lecture 28, Slide 5 Executive Summary – Mirrors & Lenses: S > 2 f real inverted smaller 2 f > S > f real inverted bigger f > S > 0 virtual upright bigger S > virtual upright smaller converging converging f converging converging f f concave concave (converging) (converging) f concave concave (converging) (converging) diverging diverging f diverging diverging f f convex convex (diverging) (diverging) f convex convex (diverging) (diverging) 1 1 1 + = ′ S S f ′ = - S M S f > 0 f < 0 Physics 212 Lecture 28, Slide 6 It’s always the same: 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) s’ is positive for a real image f is positive when it can produce a real image You just have to keep the signs straight: 1 1 1 + = ′ S S f ′ = - S M S Physics 212...
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This note was uploaded on 03/12/2012 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect28 - Physics 212 Lecture 28 Slide 1 Physics 212 Lecture...

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