---
title: 'new course : beyond'
---

! *YOUR  CHALLENGE*  :  Your image in a mirror.
! 
!  ![](objet_image_defi_v2_300.jpg)
!
! 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.
!
! _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._
!
! <details markdown=1>
! <summary>
! I choose.
! </summary>
! * Is my image simply located in my mind, or has it a location somewhere in space?
! * If my image is localized, what is its position?
! * If my image has a position, does it have a size? Is she taller or smaller than me?
! * If my image has a position, and as it is made of light, can it illuminate a screen?
! * 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?
! * Can I imagine to see more or less tall an image that has a well-defined size?
!
! 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.
! <details markdown=1>
! <summary>
! ANSWER
! </summary>
! To write.
! </details>
! </summary>


!!!! *DIFFICULT POINT* (contribute, or indicate a difficult point of understanding)
!!!!

!! *BEYOND* (to contribute)
!!

!! *CULTURAL POINT* (contributor)
!!

!!! *DO  YOU  MASTER ?*
!!! <details markdown=1>
!!! <Summary>
!!! Describe the test
!!! </summary>
!!! The text of the test (and its images, figures, audio, video, etc ...)
!!!
!!! Question text
!!! <details markdown=1>
!!! <summary>
!!! Answer choice 1
!!! </summary>
!!! Text if this answer 1 is chosen
!!! </details>
!!! <details markdown=1>
!!! <summary>
!!! Answer choice 2
!!! </summary>
!!! Text if this answer 2 is chosen
!!! </details>
!!! <!--possibility to add answers, questions-->
!!! -----
!!! <details markdown=1>
!!! <summary>
!!! Complete solution.
!!! </summary>
!!! text of the solution
!!! </details>
