Light.ppt

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Light.ppt

  1. 1. LIGHT HOW IT WORKS LIGHT how it works
  2. 2. CSS 6c HOW LIGHT MOVES <ul><li>Straight Line unless altered by what moving in. </li></ul>
  3. 3. LIGHT SCATTERS AS GOES <ul><li>Light scatters and looses energy the further away from its source. </li></ul>
  4. 4. SCATTERING <ul><li>Light released and spreads in all directions. </li></ul><ul><ul><li>Why room is even with light. </li></ul></ul><ul><ul><li>Sky blue: shortest wavelengths, spread more. </li></ul></ul>
  5. 6. REFLECTION <ul><li>Light bounces off surface at same angle it hits. </li></ul>
  6. 8. ABSORPTION <ul><li>LIGHT IS TAKEN IN BY AN OBJECT (MATTER) AND HOLDS IT. </li></ul><ul><li>ENERGY TRANSFERRED FROM LIGHT TO HEAT. </li></ul><ul><li>AIR PARTICLES DIMINISH LIGHT. </li></ul>
  7. 9. <ul><li>SCIENCE </li></ul><ul><li>LIGHTS UP </li></ul><ul><li>MY LIFE </li></ul>
  8. 10. TRAVELS THRU MATTER
  9. 11. CSS6f INTERACTS WITH MATTER <ul><li>TRANSMISSION </li></ul><ul><li>Light goes straight unless changes what it travels through. </li></ul><ul><li>Travels through matter: gases (air), liquids (water) and solid (glass). </li></ul>
  10. 12. TRANSMISSION: Terms for mediums <ul><li>Transparent - allows all light through. </li></ul><ul><li>Translucent - allows some light through. </li></ul><ul><li>Opaque - allows no light through. </li></ul>
  11. 13. <ul><li>CLEAR=TRANSPARENT </li></ul><ul><li>SMOKY=TRANSLUCENT </li></ul><ul><li>SOLID=OPAQUE </li></ul>
  12. 14. When Light Strikes an Object <ul><li>When light strikes an object, the light can be reflected, transmitted, or absorbed. </li></ul>
  13. 15. REFRACTION <ul><li>The change in direction and speed. </li></ul><ul><li>Moving from water to air, light changes angles and speed of travel. </li></ul>
  14. 16. Refraction of Light <ul><li>When light rays enter a medium at an angle, the change in speed causes the rays to bend, or change direction. </li></ul>
  15. 17. CSS 6d LENSES <ul><li>Alter direction of light. </li></ul><ul><li>Concave-spreads out. </li></ul><ul><li>Convex- brings to focal point. </li></ul>
  16. 18. LENSES con’t <ul><li>CONVEX </li></ul><ul><li>-brings image to focal point. </li></ul><ul><li>Image is larger and upside down. </li></ul><ul><li>ie: eye, microscope, magnifying glass. </li></ul><ul><li>CONCAVE </li></ul><ul><li>- spreads image out. </li></ul><ul><li>-image is smaller and upright. </li></ul><ul><li>ie: corrective glasses. </li></ul>
  17. 19. Vision: response to the stimulus of light.
  18. 21. CSS6b Scattered light enters the Eye
  19. 22. ONCE ENTERS <ul><li>LIGHT SEEN </li></ul>
  20. 23. The eye works like a camera. reorder slides
  21. 24. REVIEW Light with Matter <ul><li>TRANSMISSION - light going through </li></ul><ul><li>REFRACTION -light bending. </li></ul><ul><li>ABSORBTION - light absorbed. </li></ul><ul><li>REFLECTION - light bouncing off. </li></ul>
  22. 25. LIGHT - WHAT WE SEE <ul><li>LIGHT - energy by wavelengths at a level we can see. </li></ul><ul><li>EM Spectrum - variety of wavelengths and frequency. Light is small band within. </li></ul>
  23. 27. Terms to help understand: <ul><li>WAVELENGTH Anything that causes a disturbance and transmits energy through matter. (ie: ripple on pond) </li></ul><ul><li>FREQUENCY </li></ul><ul><li>Number of waves in set time. </li></ul><ul><li>Decides energy level. </li></ul>
  24. 28. EM ENERGY : <ul><li>Long wavelengths + </li></ul><ul><li>Low frequency = </li></ul><ul><li>LOW ENERGY </li></ul><ul><li>Short wavelengths + </li></ul><ul><li>High frequency = </li></ul><ul><li>HIGH ENERGY </li></ul>
  25. 29. What Is the Electromagnetic Spectrum? <ul><li>The electromagnetic spectrum is the complete range of electromagnetic waves placed in order of increasing frequency. </li></ul>
  26. 31. CSS 6A VISIBLE LIGHT (part of EM spectrum)
  27. 32. Light travels thru water <ul><li>(why we see blue best) </li></ul>
  28. 33. TO SEE COLOR <ul><li>Different colors represent different wavelengths. </li></ul><ul><li>Blue- smaller wavelengths </li></ul><ul><li>Red- larger wavelengths </li></ul><ul><li>Color Order: ROY G BIV </li></ul><ul><li>red, orange, yellow, green, blue, indigo, violet </li></ul>
  29. 34. CSS 6e WHITE LIGHT <ul><li>Adding color makes WHITE </li></ul><ul><li>Deleting color makes BLACK </li></ul>
  30. 35. MANY COLORS = WHITE
  31. 36. WHITE LIGHT <ul><li>Mixture of many color/wavelengths </li></ul><ul><li>All colors reflected. </li></ul><ul><li>Enters the eye’s retina </li></ul><ul><ul><li>3 cones:red, blue & green </li></ul></ul><ul><ul><li>Rods-shades </li></ul></ul>
  32. 37. Electromagnetic Waves <ul><li>Believe it or not, you are being “showered” all the time, not by rain but by waves. </li></ul>
  33. 38. COLOR -decided by what absorbed. <ul><li>If object absorbs then hides color. </li></ul><ul><li>All color absorbed = black </li></ul><ul><li>If object reflects color then see. </li></ul><ul><li>All color reflected = white </li></ul>

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