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8K LIGHT

8K LIGHT. Optical Illusions. Which is darker A or B?. Black spots appear at the intersections. The grey centre bar is the same shade everywhere! - Watch. Move your head forwards and backwards while looking at the black dot. What appears to happen?.

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8K LIGHT

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  1. 8K LIGHT

  2. Optical Illusions

  3. Which is darker A or B?

  4. Black spots appear at the intersections.

  5. The grey centre bar is the same shade everywhere! - Watch

  6. Move your head forwards and backwards while looking at the black dot. What appears to happen?

  7. There is a pipe in the stream of water that holds up the tap and supplies the water!

  8. Focus on the cross in the middle – what happens?

  9. Rabbit or duck?

  10. Rabbit or duck?

  11. Circle or spiral?

  12. This is a circle – honest!

  13. The thick black lines are parallel.

  14. B or 13?

  15. You guessed it. The red lines are straight.

  16. How many legs?

  17. Young lady or old lady?

  18. Really truly nothing is moving here!

  19. Can you see the 10 in the orange circle?

  20. What number is visible in the coloured circle? If you are colourblind you may see no number – like the grey image.

  21. Practical and sporty

  22. Can you find mother and child?

  23. A dog in the snow

  24. A dog in the snow Now can you see him?

  25. http://neave.com/strobe/

  26. TED talk optical illusions

  27. Light introduction • How does light travel? • Define: • Transparent • Translucent • Opaque

  28. Use the ray box to test if the objects are transparent, translucent or opaque

  29. Opacity • http://www.ltscotland.org.uk/resources/s/light/opacity.asp?strReferringChannel=learningteachingandassessment&strReferringPageID=tcm:4-607879-64

  30. Luminosity • What does luminous mean? • Name 3 luminous objects. • Is the moon luminous? Explain.

  31. Plane mirrors • What happens to a ray of light when it hits a mirror? • What is the imaginary line at 90° to the mirror called? • What is the ray that goes to the mirror called? • What is the ray that goes away from the mirror called? • What is the rule for the angle of incidence and angle of reflection?

  32. ReflectionPlane mirror Angle of reflection Angle of incidence Incident ray Reflected ray Normal

  33. RULE

  34. Light through a glass block • What happens to light when it passes from air to glass or vice versa? • What is this called?

  35. Refraction Emergent ray Normal Normal Incident ray

  36. Refraction • When light passes from air to glass the angle of incidence is ____________ than the angle of refraction. • When light passes from glass to air the angle of incidence is ____________ than the angle of refraction.

  37. White light • What colour is white light? • What happens when you shine white light through a prism? • Why does this happen?

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