diff --git a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/02.mirror/02.new-course-overview/cheatsheet.en.md b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/02.mirror/02.new-course-overview/cheatsheet.en.md index 51e3fc9d1..aa4dc948e 100644 --- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/02.mirror/02.new-course-overview/cheatsheet.en.md +++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/02.mirror/02.new-course-overview/cheatsheet.en.md @@ -42,3 +42,23 @@ Plane mirror, concave and convex spherical mirror ![](plane-concave-convex-mirrors.png) Fig. 1. a) plane b) concave c) convex mirrors +#### Are plane and spherical mirrors stigmatic? + +##### Perfect stigmatism of the plane mirror + +* A plane mirror is **perfectly stigmatic**. +* Object and image are symmetrical on both side of the surface of the plane mirror. +* A real object gives a virtual image.
A virtual object gives a real image. + +##### Non stigmatism of the spherical mirror + +* In each point of the spherical mirror, the law of reflection applies. +* A spherical mirror is not stigmatic: The rays (or their extensions) +* coming from an object point generally do not converge towards an image +* point (see Fig. 2.) + + + + + +