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0708_optics_mirrors_and_lenses

0708_optics_mirrors_and_lenses - Optics Optics Mirrors and...

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Unformatted text preview: Optics Optics Mirrors and Lenses Mirrors and Lenses Reflection Reflection • We describe the path of light as straight-line rays We describe the path of light as straight-line rays • Reflection off a flat surface follows a simple rule: Reflection off a flat surface follows a simple rule: – angle in (incidence) equals angle out (reflection) – angles measured from surface “normal” (perpendicular) surface normal same angle incident ray exit ray reflected ray Reflection Vocabulary Reflection Vocabulary • Real Image – Real Image – – Image is made from “real” light rays that converge at a real focal point so the image is REAL – Can be projected onto a screen because light actually passes through the point where the image appears – Always inverted Reflection Vocabulary Reflection Vocabulary • Virtual Image– Virtual Image– – “Not Real” because it cannot be projected – Image only seems to be there! Virtual Images in Plane Mirrors If light energy doesn't flow from the image, the image is "virtual". Rays seem to come from behind the mirror, but, of course, they don't. It is virtually as if the rays were coming from behind the mirror. "Virtually": the same as if As far as the eye-brain system is concerned, the effect is the same as would occur if the mirror were absent and the chess piece were actually located at the spot labeled "virtual image". Hall Mirror...
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0708_optics_mirrors_and_lenses - Optics Optics Mirrors and...

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