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PROPERTIES OF LIGHT

PROPERTIES OF LIGHT. PROPERTIES OF LIGHT. Light like all waves can be reflected at a boundary between two media. This phenomena is simply called REFLECTION Light can also be transmitted from one medium to another. This phenomena is called REFRACTION. REFLECTION OF LIGHT.

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PROPERTIES OF LIGHT

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  1. PROPERTIES OF LIGHT

  2. PROPERTIES OF LIGHT Light like all waves can be reflected at a boundary between two media. This phenomena is simply called REFLECTION Light can also be transmitted from one medium to another. This phenomena is called REFRACTION

  3. REFLECTION OF LIGHT

  4. NORMAL LINE SURFACE

  5. VIDEO THIS VIDEO SHOWS HOW A BEAMS OF LIGHT ARE REFLECTED FROM A MIRROR

  6. DIFFUSE AND SPECULAR REFLECTION • MOST OBJECTS WILL PRODUCE BOTH SPECULAR AND DIFFUSE REFLECTION. • THE RELATIVE AMOUNT OF EACH DEPENDS ON THE ANGLE FROM THE SURFACE THAT THE LIGHT IS OBSERVED.

  7. VIDEO YOU CAN GET BOTH SPECULAR AND DIFFUSE REFLECTION FROM A SURFACE.

  8. GLARE SPECULAR REFLECTION FROM A ROUGH SURFACE

  9. OPTICAL DEVICES OPTICAL DEVICES HAVE HAD A TREMENDOUS EFFECT ON THE EVOLUTION OF OUR CIVILIZATION.

  10. IMAGES • OPTICAL INSTRUMENTS CAN BE USED TO DIRECT THE LIGHT FROM AN OBJECT TO CREATE AN IMAGE. • AN IMAGE IS A LOCATION IN SPACE THAT LOOKS EXACTLY LIKE THE OBJECT, BUT ITS SIZE AND ORIENTATION MAY BE DIFFERENT.

  11. IMAGES • IF THE IMAGE IS LARGER THAN THE OBJECT, IT IS SAID TO BE “MAGNIFIED”. • IF THE OBJECT IS SMALLER THAN THE IMAGE, IT IS SAID TO BE “DIMINISHED”.

  12. MIRRORS LIGHT RAYS CAN BE DIRECTED VIA REFLECTION TO FORM IMAGES.

  13. VIRTUAL IMAGES • VIRTUAL IMAGES ARE FORMED BY MIRRORS THAT WE USE TO SEE OURSELVES. • VIRTUAL IMAGES FORMED BY THESE MIRRORS ARE LOCATED ON THE OPOSITE SIDE OF THE MIRROR. • SINCE NO LIGHT IS ACTUALLY AT THE IMAGE, THEY ARE CALLED VIRTUAL IMAGES.

  14. VIDEO • THESE VIDEO CLIPS SHOW THE IMAGES PRODUCED WHEN LIGHT IS REFLECTED FROM A PLANE , CONVEX AND CONCAVE MIRROR. • ALL OF THESE IMAGES ARE VIRTUAL.

  15. virtual image object d d PLANE MIRROR

  16. virtual image object CONCAVE MIRROR

  17. virtual image object CONVEX MIRROR

  18. REAL IMAGE IF THE IMAGE IS ON THE SAME SIDE OF THE MIRROR AS THE OBJECT, IT IS SAID TO BE “REAL” SINCE THERE WILL BE LIGHT AT ITS LOCATION.

  19. MIRROR SIMULATIONS SURENDRANATH HAS SIMULATIONS ON HIS CD THAT SHOW HOW IMAGES ARE FORMED BY CONVEX AND CONCAVE MIRRORS.

  20. REFRACTION

  21. REFRACTION The change in the direction of travel due to a change in speed of the wave.

  22. VIDEO A PENCIL IN A GLASS OF WATER.

  23. VIDEO THE DIRECTION OF TRAVEL OF A TOY CAR IS AFFECTED AS IT TRAVELS ACROSS CARPET.

  24. REFRACTION The angle of incidence or refraction is smaller in the medium in which the speed of light is slower. This is usually a more dense medium.

  25. REFRACTION SIMULATION SURENDRANATH HAS SIMULATIONS ON HIS CD THAT SHOW HOW LIGHT WAVES ARE REFRACTED AS THEY TRAVEL FROM AIR INTO A DENSE MEDIUM. NOTICE THAT THE WAVES TRAVEL SLOWER IN THE MORE DENSE MATERIAL.

  26. REFRACTION I RF LESS DENSE (FASTER) RF I MORE DENSE (SLOWER)

  27. LOCATING OBJECTS UNDER WATER

  28. LENSES

  29. VIDEO THIS VIDEO SHOWS HOW A LIGHT BEAM IS REFRACTED THROUGH A LARGER ANGLE AS THE ANGLE OF THEN PRISM INCREASES.

  30. CONVERGING LENS FOCAL POINT FOCAL LENGTH

  31. DIVERGING LENS Focal point focal length

  32. DEMONSTRATION Hold a lens in front of your eye. Ask the kids if your eye looks larger or smaller. Which type lens makes your eye look larger? Which type lens makes your eye look smaller?

  33. FAR SIGHTED • (HYPEROPIA) • DISTANT OBJECTS ARE SEEN DISTINCTLY • THE EYE DOES NOT CONVERGE THE LIGHT ENOUGH • A CONVERGENT LENS IS USED TO CORRECT NEAR VISION

  34. HYPEROPIA (far sighted)

  35. HYPEROPIA CORRECTION

  36. NEAR SIGHTED • (MYOPIA) • NEAR OBJECTS ARE SEEN DISTINCTLY • THE EYE CONVERGES THE LIGHT TOO MUCH • A DIVERGENT LENS IS USED TO CORRECT FAR VISION

  37. MYOPIA (nearsighted)

  38. MYOPIA CORRECTION

  39. DISPERSION THE REFRACTION OF DIFFERENT WAVELENGTHS DUE TO THE FACT THAT THEY TRAVEL AT DIFFERENT SPEEDS THROUGH LIGHT MEDIA.

  40. RAINBOW SURENDRANATH HAS SIMULATIONS ON HIS CD THAT SHOW HOW LIGHT WAVES ARE REFRACTED BY RAINDROPS TO PRODUCE A RAINBOW. DISPERSION CAUSES THE COLORS TO REFRACT AT DIFFERENT ANGLES.

  41. PROPERTIES OF LIGHT SUMMARY • REFLECTION • DIFFUSE & SPECULAR • IMAGES & MIRRORS • REFRACTION • PRISMS AND LENSES • VISION CORRECTION • DISPERSION & RAINBOWS

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