Lect16 - Lecture 16 Mirrors Lenses Wednesday Mirror Summary...

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1 Lecture 16: Mirrors & Lenses Remainder of Chapter 24 Reflection at Spherical Surfaces Refraction through Lenses October 11 Physics 104, Fall 2011 1 Wednesday Mirror Summary Angle of incidence = Angle of Reflection Principal Rays – Parallel to P.A.: Through focus – Through focus: Parallel to P.A. – Through center: Back on self |f | = R/2 Positive for Concave mirror Negative for Convex mirror October 11 Physics 104, Fall 2011 2 October 11 Physics 104, Fall 2011 3 Compared to the original arrow the image is? 1. Larger 2. Smaller 3. The same size R f p.a. Reading Quiz c October 11 Physics 104, Fall 2011 4 O I d i Mirror Equation Mirror Equation: 1 d o + 1 d i = 1 f f d o d o = distance object is from mirror ( + in front - behind ) d i = distance image is from mirror ( + in front - behind ) An arrow is placed 6 cm in front of a concave mirror with focal length f=2 cm. Determine the image location. f = focal length of mirror (R/2) (+ in front - behind ) 1 6 cm + 1 d i = 1 2 cm d i = 3 cm in front of mirror SIGNS d 0 : positive is side light comes from (before hitting mirror) d i : positive is side light goes to (after hitting mirror) positive is REAL image negative Virtual f: positive is side light goes to (after hitting mirror) positive is converging negative diverging October 11 Physics 104, Fall 2011 5 +d o +d i +f Mirror Concave Mirror : Reading Quiz 6 The image produced by a concave mirror of a real object is: October 11 Physics 104, Fall 2011 6 1) Always Real 2) Always Virtual 3) Sometimes Real, Sometimes Virtual Mirror Equation: 1 d o + 1 d i = 1 f 1 d i = 1 f 1 d 0 Concave mirror : f > 0 Real Object means in front of mirror: d o > 0 d i can be negative or positive!
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2 Convex Mirror Question Where should you place an object in front of a convex mirror to produce a real image? October 11 Physics 104, Fall 2011 7 1) Object close to mirror 2) Object far from mirror 3) Either close or far 4) You can’t Mirror Equation: 1 d o + 1 d i = 1 f 1 d i = 1 f 1 d 0 d i is negative!
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