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  1. ---
  2. title: 'new course : beyond'
  3. ---
  4. ! *YOUR CHALLENGE* : Your image in a mirror.
  5. !
  6. ! ![](objet_image_defi_v2_300.jpg)
  7. !
  8. ! We all have the opportunity to look at ourselves in a mirror. We see our own image. But perhaps it is interesting to take the time of interrogative observation, and then to test yourself.
  9. !
  10. ! _Do not look at the answer, take time to think, a few days if necessary. The time to build your mental representation of the phenomenon, to formulate it in words is important, a thousand times more important than the ephemeral instant where you read the fews words of the solution._
  11. !
  12. ! <details markdown=1>
  13. ! <summary>
  14. ! I choose.
  15. ! </summary>
  16. ! * Is my image simply located in my mind, or has it a location somewhere in space?
  17. ! * If my image is localized, what is its position?
  18. ! * If my image has a position, does it have a size? Is she taller or smaller than me?
  19. ! * If my image has a position, and as it is made of light, can it illuminate a screen?
  20. ! * If I retreat a little from the mirror, I see my image decreasing slightly. Why? Is the size of my image really smaller? Or does it keep its size and I'm the one who sees it smaller?
  21. ! * Can I imagine to see more or less tall an image that has a well-defined size?
  22. !
  23. ! These questions that I ask myself about my image, I have to ask them about an real object that I see in front of me.
  24. ! <details markdown=1>
  25. ! <summary>
  26. ! ANSWER
  27. ! </summary>
  28. ! To write.
  29. ! </details>
  30. ! </summary>
  31. !!!! *DIFFICULT POINT* (contribute, or indicate a difficult point of understanding)
  32. !!!!
  33. !! *BEYOND* (to contribute)
  34. !!
  35. !! *CULTURAL POINT* (contributor)
  36. !!
  37. !!! *DO YOU MASTER ?*
  38. !!! <details markdown=1>
  39. !!! <Summary>
  40. !!! Describe the test
  41. !!! </summary>
  42. !!! The text of the test (and its images, figures, audio, video, etc ...)
  43. !!!
  44. !!! Question text
  45. !!! <details markdown=1>
  46. !!! <summary>
  47. !!! Answer choice 1
  48. !!! </summary>
  49. !!! Text if this answer 1 is chosen
  50. !!! </details>
  51. !!! <details markdown=1>
  52. !!! <summary>
  53. !!! Answer choice 2
  54. !!! </summary>
  55. !!! Text if this answer 2 is chosen
  56. !!! </details>
  57. !!! <!--possibility to add answers, questions-->
  58. !!! -----
  59. !!! <details markdown=1>
  60. !!! <summary>
  61. !!! Complete solution.
  62. !!! </summary>
  63. !!! text of the solution
  64. !!! </details>