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Prism

Copy please. Prism. What happens when we shine white light into a prism?. Red lights bends the least. Many colours blended together. White light. Violet light bends the most. Last lesson. Refraction of light. Refraction. Beam of light.

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Prism

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  1. Copy please Prism What happens when we shine white light into a prism? Red lights bends the least Many colours blended together White light Violet light bends the most

  2. Last lesson • Refraction of light

  3. Refraction Beam of light Light going from air to glass bends towards the normal Glass block Light going from glass to air bends away the normal

  4. The mug trick!

  5. The mug trick!

  6. Homework – To show and explain this to your parents! Due Friday 29th Jan

  7. Prism What happens when we shine white light into a prism? Red lights bends the least Many colours blended together White light Violet light bends the most

  8. Today’s lesson • Total Internal Reflection • Fibre-optic cables • Seeing colours

  9. Another little investigation! Aim all beams at the centre of the semi circle

  10. Another little investigation! Aim all beams at the centre of the semi circle

  11. Total Internal Reflection

  12. Critical Angle?

  13. Critical Angle?

  14. Critical Angle?

  15. Critical Angle?

  16. Critical Angle? Critical angle

  17. Copy please! Total Internal Reflection If the angle is bigger than the critical angle we get total internal reflection

  18. Total Internal Reflection Critical angle sin c = 1/η sin(critical angle) = 1/(refractive index)

  19. Examples of Total Internal Reflection

  20. Examples of Total Internal Reflection

  21. Examples of Total Internal Reflection

  22. Examples of Total Internal Reflection

  23. Examples of Total Internal Reflection

  24. Examples of Total Internal Reflection

  25. Seeing and colours

  26. We see things because light is reflected into our eyes

  27. Red objects only reflect red light

  28. A Red objects in green light would look black (no reflected light)

  29. YouTube - Bill Nye the Science Guy - 16 - Light and Color 1/3 YouTube - Bill Nye the Science Guy - 16: Light and Color 2/3Related Videos Combining light

  30. Let’s try some questions! “Coloured lights”

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