@ -180,12 +180,16 @@ Sont proposées les catégories suivantes, mais à débattre :
! <summary>
! What are the two optical systems at the origin of the two images of the painting? And can you characterize each of the single optical elements (+ their relative distances) that make up each of these optical systems ?
! </summary>
! * A first optical system $`OS1`$ is composed of a simple convexe spherical mirror (the object is reflected on the front face of the ball lensball). Keaping the ioptical axis positively oriented in the direction of the incident light propagation on the lensball, the algebraic value of the mirror radius is : $\overline{SC}=+5\;cm$.
! * A first optical system $`OS1`$ is composed of a simple convexe spherical mirror (the object is reflected on the front face of the ball lensball). Keaping the ioptical axis positively oriented in the direction of the incident light propagation on the lensball, the algebraic value of the mirror radius is : $`\overline{SC}=+5\;c`$.
! * The second optical system $`OS2`$ is composed of three simple optical elements :<br><br>
! 1) The light crosses a spherical refracting surface $`DS1`$ with characteristics : $`\overline{S_1C_1}=+|R|=+5\;cm`$ , $`n_{ini}=1`$ and $`n_{fin}=1.5`$.<br><br>
! 2) Then the light is reflected at the surface of the last lensball interface that acts like a spherical mirror of characteristics : $`\overline{S_2C_2}=-|R|=-5\;cm`$, $`n=1.5`$.<br><br>
! 3) Finally the light crosses back the first interface of the lensball that acts like a spherical refracting surface those characteristics are : $`\overline{S_3C_3}=+|R|=+5\;cm`$ , $`n_{ini}=1.5$ and $n_{fin}=1`$.<br><br>
! Relative algebraic distances between the different elements of $`OS2`$ are :<br>
! 1) The light crosses a spherical refracting surface $`DS1`$ with characteristics : $`\overline{S_1C_1}=+|R|=+5\;cm`$ , $`n_{ini}=1`$ and $`n_{fin}=1.5`$.
!
! 2) Then the light is reflected at the surface of the last lensball interface that acts like a spherical mirror of characteristics : $`\overline{S_2C_2}=-|R|=-5\;cm`$, $`n=1.5`$.
!
! 3) Finally the light crosses back the first interface of the lensball that acts like a spherical refracting surface those characteristics are : $`\overline{S_3C_3}=+|R|=+5\;cm`$ , $`n_{ini}=1.5$ and $n_{fin}=1`$.
!
! Relative algebraic distances between the different elements of $`OS2`$ are :
!
! $`\overline{S_1S_2}=+10\;cm`$ and $`\overline{S_2S_3}=-10\;cm`$
