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16_optics_r1 - Optics Reflection Refraction Optical Systems...

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Optics Optics Reflection & Refraction Reflection & Refraction Optical Systems Optical Systems
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UCSD: Physics 8; 2008 2 Reflection Reflection We describe the path of light as straight-line rays We describe the path of light as straight-line rays We call this geometrical optics Reflection off a flat surface follows a simple rule: Reflection off a flat surface follows a simple rule: angle in = angle out Angle of incidence = angle of reflection angles measured from surface “normal” (perpendicular) surface normal Angle of incidence incident ray reflected ray Angle of reflection mirror
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UCSD: Physics 8; 2008 3 Reflection, continued Reflection, continued Also consistent with “ Also consistent with “ principle of least time principle of least time If going from point A to point B, reflecting off a mirror, the path traveled is also the most expedient (shortest) route A B too long shortest path; equal angles
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UCSD: Physics 8; 2008 4 Hall Mirror Hall Mirror Useful to think in terms of Useful to think in terms of images images virtual image” of you “real” you mirror only needs to be half as high as you are tall. Your image will be twice as far from you as the mirror. Question ..
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UCSD: Physics 8; 2008 5 Curved mirrors Curved mirrors What if the mirror isn’t flat? What if the mirror isn’t flat? light still follows the same rules, with local surface normal Parabolic mirrors focus parallel rays to one point Parabolic mirrors focus parallel rays to one point used in telescopes, backyard satellite dishes, etc. also forms virtual image
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UCSD: Physics 8; 2008 6 Refraction = Bending Refraction = Bending Light also goes Light also goes through through some things some things glass, water, eyeball, air The presence of material slows light’s progress
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