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P8 light


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IGCSE Physics Light presentation

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P8 light

  1. 1. Physics P8 Light
  2. 2. Angle of incidence = Angle of reflection
  3. 3. Periscope
  4. 4. Position of Image – the image is as far behind the mirror as the object is in front
  5. 5. Lateral inversion
  6. 6. Real and Virtual ImagesThe image being reflected in the first diagram above isa virtual image. When looking at a mirror image, the lightrays that reflect off the mirror into your eye appear tocome from the image. This virtual image cannot beprojected onto a screen like at the cinema, unlike a realimage. A real image can because it is formed by focusinglight rays onto a screen.
  7. 7. Refraction
  8. 8. Rules for refraction• Ray of light bends towards the normal when it slows down• Ray of light bends away from the normal when it speeds up• A ray of light travelling along the normal is not refracted
  9. 9. Real and apparent depth
  10. 10. Key terms: medium normal intersect incident ray refracted ray parallel optical density
  11. 11. Semi-circular block
  12. 12. Visible Light
  13. 13. Prisms
  14. 14. Dispersion
  15. 15. Total Internal Reflection• _org02_ilo11/b_activity.html• This is caused by refraction of rays from an optically dense medium to an optically less dense medium (e.g. glass to air)
  16. 16. Critical Angle• At the critical angle (cº) the angle of refraction is 90º• If the angle of incidence is greater than the critical angle, all of the light is reflected inside the denser medium.• The light shows total internal reflection.
  17. 17. Optical Fibres
  18. 18. Uses of optical fibres• Communincations • Medecine