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# lecture17 - Physics 102 Lecture 17 Reflection and...

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Physics 102: Lecture 17 Reflection and Refraction of Light

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Recall from last time…. Reflection: Refraction: Flat Mirror: image equidistant behind Spherical Mirrors: Concave or Convex Today Last Time 5 θ i θ r θ 1 θ 2 n 2 n 1 θ i = θ r n 1 sin( θ 1 )= n 2 sin( θ 2 )
O Concave Mirror Principal Rays f c 1) Parallel to principal axis reflects through f. #1 3) Through center. #3 Image is (in this case): Real (light rays actually cross) Inverted (Arrow points opposite direction) Reduced (smaller than object) 10 **Every other ray from object tip which hits mirror will reflect through image tip 2) Through f, reflects parallel to principal axis. #2 I

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C f 1) 2) 3) p.a. Preflight 17.1 Ray through center should reflect back on self. 13 20% 45% 35% Which ray is NOT correct?
O I Mirror Equation    1 d o + 1 d i = 1 f f c d o 16 d i d o = distance object is from mirror: Positive: object in front of mirror Negative: object behind mirror d i = distance image is from mirror: Positive: real image (in front of mirror) Negative: virtual image (behind mirror) f = focal length mirror: Positive: concave mirror +R/2 Negative: convex mirror –R/2 Works for concave, convex, or flat

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Preflight 17.3 The image produced by a concave mirror of a real object is: Mirror Equation:    1 d o + 1 d i = 1 f 1) Always Real 2) Always Virtual 3) Sometimes Real, Sometimes Virtual i 0 1 1 1 = - d f d Concave mirror: f > 0 Real Object means in front of mirror: d o > 0 20 d i is positive if d 0 > f ; negative is d 0 < f .
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lecture17 - Physics 102 Lecture 17 Reflection and...

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