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Unformatted text preview: 1 The law of reflection: 1 1 = The law of refraction: 2 2 1 1 sin sin n n = Snells Law Image formation 2 Ray Optics  Applications: Image Formation Chapter 23 3 object real image virtual image Images are always located by extending diverging rays back to a point at which they intersect Images are located either at a point from which the rays of light actually diverge or at a point from which they appear to diverge To find the image it is usually enough to find intersection of just two rays! Magnification = image height object height 4 Flat Refracting Surface 1 2 2 2 1 1 sin sin n n = Snells Law d 2 2 sin d q 1 1 sin d p 2 1 d d n n q p = 2 1 n q p n = Image is always virtual 5 Flat mirror Chapter 23 6 One ray starts at point P , travels to Q and reflects back on itself Another ray follows the path PR and reflects according to the law of reflection The triangles PQR and PQR are congruent .  magnification is 1. Flat Mirror The law of reflection h h = always virtual image 7 Geometric Optics  Applications: Thin Lenses Chapter 36 8 Thin Lenses Thin means that the width is much smaller than the radius of curvature 9 Thin Lenses s s ? s = 1 1 1 s s f + = Thin Lens Equation: Object Distance Image Distance Focal Length The thin lens is characterized only by one parameter FOCAL LENGTH . 10 Thin Lenses: Focal Length ? f = 1 2 1 1 1 ( 1) n f R R = n + Strategy of Finding f : Define positive and negative sides usually the left side (the side where the object is) is defined as a positive You are going from the positive side, then the first lens surface is defined as surface 1 with the radius of curvature and the center of curvature at point Sign rule: if is in the positive side if is in the negative side...
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 Spring '08
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