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Lesson 2. How does Light Behave ?

Lesson 2. How does Light Behave ?. April , 2014 Pg. B122. Reflection of Light. Light travels in staight lines . When a light is placed so that it shines perpendicular to a mirror , the beam is reflected straight back.

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Lesson 2. How does Light Behave ?

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  1. Lesson 2. Howdoes Light Behave? April, 2014 Pg. B122

  2. Reflection of Light • Light travels in staightlines. When a light isplaced so thatitshines perpendicular to a mirror, thebeamisreflectedstraight back. • Whenparallelrays of light reflectedfromanobject strike a smoothsurface, such as a mirror, theybounce off as parallelrays. Therefore, thereflectedimage of theobject can be seenclearly. • Whenparallelrays of light reflectedfromanobject strike a rough surface, they are reflected in differentdirections, and no clearimageisreflected.

  3. Convex and ConcaveMirrors • A convexmirror curves outward in the center, towardanobject placed in front of it. Light relfectedfrom a convexmirror diverges. The light rayswillnevercross, so theimagewillalwaysappearupright. Theimageappearssmaller.

  4. A concavemirrorisonewhose center curves awayformoneobject placed in front of it. A concavemirror causes thebeams of parallel light strikingit to converge whenthey are reflected. The light isreflectedtowardthe center of the curve wherethebeamscross.

  5. Windows reflectlike a mirrorwhenmost of the light strikingthewindow comes fromtheobserver´sside of theglass. • Anotherimportant use of reflectionis in fiberoptics light travelingthrough a plasticorglassfiberthat can be as thin as hair.

  6. Refraction Light • Refraction: isthebending of light as itpassesfromonetransparentsubstance to another at anangleotherthan 90 degrees. • Thedenserthetransparent material, the more light slowsdown and the more itbends. • A lensis a curvedpiece of glass, plastic, orotherclear material thatrefracts light thatpassesthroughit. As light passesthroughlenses, itisalwaysbenttowardthethickerpart of thelens.

  7. In a convexlens, theparallel light raysbendtowardthe center as theypassintothelens and, again, as theypassout of thelens. • In a concavelens, theparallelraysenteringthelensfromthe air bendtowardthethickeredges of thelens, so a concavelens spreads thelight rays. • Focal point: thepoint at which light raysmeetwhenreflected of refracted.

  8. Laser Light • Ordinary light, such as that of a flashlight, travelsoutfromthesource in alldirections. Laser light differsfromordinary light becauseitismade up of a single wavelengthwithallthewaveslined up. • Laser light: is light of a single wavelengthwithallthewaveslined up. • Lasers are used in a variety of applications. They can moveinformation in devicessuch as CD players and cash registers. Low-poweredlasersmay be used to do delicateeyesurgery, whilehigh-poweredlasers can cutthroughthicksheets of metal.

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