---
title: Beyond
media_order: 'light-straight-line-640.png,OG_rayons_foret.mp3,OG_rayons_foret.ogg,rays_forest.jpg'
---

! *YOUR  CHALLENGE*  :  look at the picture, and think of the right answers to the following questions
!
! ![](light-straight-line-640.png)
!
! * To form an image, for me to see an object, the light rays must enter my eye. Here, I see light rays that do not fit in my eye, how is this possible? What do I see ?"
! * If the sun was at infinite, its light rays should be parallel but their are not... How to explain this ?*
!
! _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>
! INDICE "key word"
! </summary>
! diffusion
! </details>
! <details markdown=1>
! <summary>
! ANSWER
! </summary>
! diffusion
! </details>


!!!! *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>
