102 lect17_handout

102 lect17_handout - Physics 102: Lecture 17 Reflection and...

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Physics 102: Lecture 17, Slide 1 Physics 102: Lecture 17 Reflection and Refraction of Light
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Physics 102: Lecture 17, Slide 2 Recall from last time…. Reflection: Refraction: Flat Mirror: image equidistant behind Spherical Mirrors: Concave or Convex Today Last Time 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 )
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Physics 102: Lecture 17, Slide 3 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) **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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Physics 102: Lecture 17, Slide 4 C f 1) 2) 3) p.a. Preflight 17.1 Ray through center should reflect back on self. 20% 45% 35% Which ray is NOT correct?
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Physics 102: Lecture 17, Slide 5 O I Mirror Equation 1 d o + 1 d i = 1 f f c d o d i •d o = distance object is from mirror: Positive: object in front of mirror Negative: object behind mirror 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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Physics 102: Lecture 17, Slide 6 Preflight 17.3 The image produced by a concave mirror of a real object is: 1) Always Real 2) Always Virtual 3) Sometimes Real, Sometimes Virtual
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102 lect17_handout - Physics 102: Lecture 17 Reflection and...

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