1 / 10

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.

nhung
Download Presentation

Lesson 2. How does Light Behave ?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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.

More Related