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# db_lec17_post - Exam 2(Tuesday March 27 8:00-9:30 PM...

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3/18/12 1 Exam 2 (Tuesday March 27, 8:00-9:30 PM) NOTE THAT FEW EQUATIONS WILL BE GIVEN – YOU ARE REMINDED THAT IT IS YOUR RESPONSIBILITY TO CREATE WHATEVER TWO-SIDED CRIB SHEET YOU WANT TO BRING TO THIS EXAM. Location STEW 183 Covers all readings, lectures, homework from Chapters 17 through 24 but with main focus on 20-24. The exam will be multiple choice and is meant to be done within 60 minutes by a well-prepared student. We will give 90 minutes starting promptly at the listed time, so please be on time! Be sure to bring your student ID card, calculator, pencil and 2 one-page (two- side) crib sheet. D. Bortoletto PHYS221

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3/18/12 2 Exam 2 PREPARATION D. Bortoletto PHYS221 * We will post a practice exam in CHIP this week (no points given to complete) * Lecture on March 26 is cancelled * We will have a practice session during the time scheduled for the lecture
Lecture 17 PHYS221 3/18/12 D. Bortoletto PHYS221 3 • Last Lecture Reflection: Refraction: ir θθ = incident ray reflected ray θ 1 r n 1 =c/v 1 refracted ray 2 n 2 =c/v 2 If n 1 > n 2 then θ 2 > θ 1 If n 2 > n 1 then θ 1 > θ 2 Refracted ray bends away from normal Refracted ray bends toward the normal • This lecture – Mirrors – Lenses 11 2 2 sin sin nn =

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Last Lecture: Plane Mirror A plane mirror is a spherical mirror with an infinite radius of curvature. O Height = I Height

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3/18/12 6 Spherical Mirrors Concave Mirror : (e.g. make up mirror) Center of curvature is in front of mirror Field of view is smaller than for plane mirror Object Height < Image Height Convex Mirror: (e.g. surveillance mirror) Center of curvature is behind mirror Field of view is larger than for plane mirror Object Height > Image Height DEMO Note p=s o and i=s i in your book S I S O R S I S O R
3/18/12 7 Focal Points of Spherical Mirrors DEMO Concave: Parallel rays close to central axis reflect through a common point F. F is called the focal point. f is the focal length (distance from center of mirror to F). Convex: The extensions of the reflected rays pass through a common point behind the mirror. 2 R f = Sign Convention: R & f are positive for concave mirror. R & f are negative for convex mirror .

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3/18/12 8 Images from Spherical Mirrors (b) O at the focal point: *image is ambiguous *rays do not cross to form image (a) O is inside the focal point: *image appears behind the mirror *S i is negative *virtual image *same orientation (c) O is outside the focal point: *image is inverted & in front of the mirror *S i is positive *real image DEMO S O S I
3/18/12 9 Spherical Mirrors • S o > 0

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db_lec17_post - Exam 2(Tuesday March 27 8:00-9:30 PM...

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