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The King David High School<br />Science Department<br />Reflection and Refraction<br />By Mr Jones<br />
Reflection<br />For light reflecting off a plane mirror (flat, smooth, shiny):<br />Normal<br />Reflected Ray<br />Inciden...
Reflection<br />For light reflecting off a plane mirror (flat, smooth, shiny):<br />Mirror<br />=<br />Angle of reflection...
Refraction<br />Incident Ray<br />Normal<br />Air<br />Perspex<br />Refracted Ray<br />Normal<br />Emergent Ray<br />
Refraction<br /><ul><li>As light passes from a less optically dense material into a more optically dense material it moves...
As light passes from a more optically dense material into a less optically dense material it moves away from the normal. <...
Total Internal Reflection<br /><ul><li>When the angle of incidence is small (less than 42°) most of the light emerges from...
A tiny amount of light is reflected at the interface. </li></ul>Incident Ray<br />Reflected Ray<br />i<42°<br />Refracted ...
Total Internal Reflection<br /><ul><li>When the angle of incidence is 42° most of the light is refracted at 90° from the n...
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Refraction

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Transcript of "Refraction"

  1. 1. The King David High School<br />Science Department<br />Reflection and Refraction<br />By Mr Jones<br />
  2. 2. Reflection<br />For light reflecting off a plane mirror (flat, smooth, shiny):<br />Normal<br />Reflected Ray<br />Incident Ray<br />The normal is a line drawn at right angles (perpendicular) to the surface.<br />i<br />r<br />Mirror<br />=<br />Angle of reflection (r)<br />Angle of incidence (i)<br />
  3. 3. Reflection<br />For light reflecting off a plane mirror (flat, smooth, shiny):<br />Mirror<br />=<br />Angle of reflection (r)<br />Angle of incidence (i)<br />
  4. 4. Refraction<br />Incident Ray<br />Normal<br />Air<br />Perspex<br />Refracted Ray<br />Normal<br />Emergent Ray<br />
  5. 5.
  6. 6. Refraction<br /><ul><li>As light passes from a less optically dense material into a more optically dense material it moves towards the normal.
  7. 7. As light passes from a more optically dense material into a less optically dense material it moves away from the normal. </li></ul>Normal<br />Incident Ray<br />Less optically dense<br />More optically dense<br />More optically dense<br />Less optically dense<br />Emergent Ray<br />Normal<br />
  8. 8.
  9. 9.
  10. 10.
  11. 11.
  12. 12.
  13. 13. Total Internal Reflection<br /><ul><li>When the angle of incidence is small (less than 42°) most of the light emerges from the Perspex and is refracted away from the normal.
  14. 14. A tiny amount of light is reflected at the interface. </li></ul>Incident Ray<br />Reflected Ray<br />i<42°<br />Refracted Ray<br />
  15. 15. Total Internal Reflection<br /><ul><li>When the angle of incidence is 42° most of the light is refracted at 90° from the normal (along the interface).
  16. 16. Some light is reflected at the interface.
  17. 17. 42° is described as the critical angle.</li></ul>Incident Ray<br />42°<br />90°<br />
  18. 18. Total Internal Reflection<br /><ul><li>When the angle of incidence is greater than 42° no refraction takes place.
  19. 19. All of the light is reflected.
  20. 20. This is known as total internal reflection.</li></ul>Incident Ray<br />Reflected Ray<br />i>42°<br />
  21. 21. Total Internal Reflection<br />
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