Lect27 - Physics 212 Lecture 27 Mirrors Physics 212 Lecture...

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Physics 212 Lecture 27, Slide 1 Physics 212 Lecture 27: Mirrors
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Music Who is the Artist? A) Soul Rebels Brass Band B) John Boutte C) New Orleans Nightcrawlers D) Paul Sanchez & Shammar Allen E) Alex McMurray and Matt Perrine Why? Threadhead Records Beats Shazam !! Fan-funded and volunteer run record company Wonderful music from New Orleans Hint: Thursday’s artists also did a great set at Lagniappe stage last Jazzfest
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Physics 212 Lecture 27, Slide 3 Your Comments 05 “Since the extended rays intersect behind the convex mirror, where there is no light, is the image produced virtual or real? wouldn't the image just be magnified? I'm so confused.” “When are images real and when are they inverted in mirrors?” “Not too bad. Just a recap of all the sign conventions including lenses would be nice” How can you have a real image with a mirror? It always looks like we're looking at something behind the mirror. I don't understand how a mirror can produce a real image. We will Do Examples Clarify Sign Conventions Note How Similar This Lecture is to the Lenses Lecture !! “Go over drawing the lines for convex mirrors again” Even better – the calculation “When you look at a shiny spoon, you can see yourself upside down on the concave part, and right side up on the convex part. When I was little I always wondered how that worked. Now I do. ;D” “Spoons. I use them a lot to justify my answer. Thanksgiving was so good to me.” “spoons and beans!”
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Physics 212 Lecture 27, Slide 4 Some Exam Stuff Exam tomorrow night at 7:00 Covers material in Lectures 19 – 26: LC circuits to lenses (not mirrors) Bring your ID: Rooms determined by discussion section (see link) Conflict exam at 5:15 – Loomis 151 If you have conflicts with both of these, you should have heard from Prof. Park about scheduling Final EXAM “Combined”: Wed, Dec. 14, 7:00 – 10:00 p.m. “Conflict”: Thurs, Dec. 15, 1:30 – 4:30 p.m. Bring your ID: Rooms to be announced by next week Brief review next Tues. Questions on final ~ uniformly divided over all course material
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Physics 212 Lecture 27, Slide 5 Reflection θ i θ r That’s all of the physics – everything else is just geometry! Angle of incidence = Angle of reflection θ i = θ r
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Physics 212 Lecture 27, Slide 6 Flat Mirror All you see is what reaches your eyes You think object’s location is where rays appear to come from. θ r θ i Flat Mirror Object All rays originating from peak will appear to come from same point behind mirror! 12 Image
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Physics 212 Lecture 27, Slide 7 Flat Mirror (4) Lines appear to intersect a distance d behind mirror. This is the image location. Virtual Image: No light actually gets here d d (1) Draw first ray perpendicular to mirror 0 = θ i = θ r (2) Draw second ray at angle. θ i = θ r θ r θ i (3) Extend the reflected rays behind the mirror
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Physics 212 Lecture 27, Slide 8 If she stands closer to the mirror, what will be the lowest part of her reflection she can see in the mirror.
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