16_optics_r - Optics Optics Reflection& Refraction...

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Unformatted text preview: Optics Optics Reflection & Refraction Reflection & Refraction Optical Systems Optical Systems Spring 2006 UCSD: Physics 8; 2006 2 Reflection Reflection • We describe the path of light as straight-line rays We describe the path of light as straight-line rays – “geometrical optics” approach • Reflection off a flat surface follows a simple rule: Reflection off a flat surface follows a simple rule: – angle in (incidence) equals angle out – angles measured from surface “normal” (perpendicular) surface normal same angle incident ray exit ray Spring 2006 UCSD: Physics 8; 2006 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 Spring 2006 UCSD: Physics 8; 2006 4 Hall Mirror Hall Mirror • Useful to think in terms of Useful to think in terms of images images “image” 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. Spring 2006 UCSD: Physics 8; 2006 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 have exact focus Parabolic mirrors have exact focus – used in telescopes, backyard satellite dishes, etc. – also forms virtual image Spring 2006 UCSD: Physics 8; 2006 6 Refraction Refraction • Light also goes Light also goes through through some things some things – glass, water, eyeball, air • The presence of material slows light’s progress The presence of material slows light’s progress – interactions with electrical properties of atoms • The “light slowing factor” is called the The “light slowing factor” is called the index of refraction index of refraction...
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This note was uploaded on 02/12/2012 for the course PHYSICS 104 taught by Professor Staff during the Fall '10 term at Rutgers.

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16_optics_r - Optics Optics Reflection& Refraction...

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