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Commit 9b7f0e09 authored by Claude Meny's avatar Claude Meny
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suite update

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    01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/02.plane-refracting-surface-overview/cheatsheet.en.md
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    ...@@ -64,18 +64,18 @@ refracting interface corresponds to two different plane refracting surfaces :<br ...@@ -64,18 +64,18 @@ refracting interface corresponds to two different plane refracting surfaces :<br
    #### Non stigmatism of spherical refracting surfaces #### Non stigmatism of spherical refracting surfaces
    ![](dioptre-spherique-snell-law)<br> ![](dioptre-spherique-snell-law.png)<br>
    Fig. 3. : In each point of the spherical refracting surface, the Snell-Descartes relation applies. Fig. 3. : In each point of the spherical refracting surface, the Snell-Descartes relation applies.
    ![](dioptre-spherique-non-stigmatique-1)<br> ![](dioptre-spherique-non-stigmatique-1.png)<br>
    Fig. 4. : A spherical refracting surface is not stigmatic: The rays (or their extensions) coming Fig. 4. : A spherical refracting surface is not stigmatic: The rays (or their extensions) coming
    from an object point generally do not converge towards an image point. from an object point generally do not converge towards an image point.
    ![](dioptre-spherique-non-stigmatique-2)<br> ![](dioptre-spherique-non-stigmatique-2.png)<br>
    Fig. 5a. : If we limit the opening of the spherical refracting surface so that only the rays Fig. 5a. : If we limit the opening of the spherical refracting surface so that only the rays
    meeting the surface near the vertex are refracted through the surface. meeting the surface near the vertex are refracted through the surface.
    ![](dioptre-spherique-gauss-conditions)<br> ![](dioptre-spherique-gauss-conditions.png)<br>
    Fig. 5b. : and if the object points remain close to the optical axis, so that the angles of Fig. 5b. : and if the object points remain close to the optical axis, so that the angles of
    incidence and refraction remain small, then for each object point an image point can be almost incidence and refraction remain small, then for each object point an image point can be almost
    defined, and therefore the spherical refracting surface becomes quasi-stigmatic. defined, and therefore the spherical refracting surface becomes quasi-stigmatic.
    ......
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