From 93aa8bfde907af561de35f306ff043d27d87d331 Mon Sep 17 00:00:00 2001 From: Claude Meny Date: Wed, 9 Oct 2019 22:12:40 +0200 Subject: [PATCH] overview mirrors (temporary) --- .../02.new-course-overview/cheatsheet.en.md | 40 ++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) 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 10d788880..635065163 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 @@ -2,4 +2,42 @@ title: 'new course : overview' --- -new course : overview \ No newline at end of file +### The mirror + +#### What is a mirror ? + +##### Objective + +* initial : to **reflect** light, to **focus or disperse light**. +* Ultimate : to **realize images**, alone or as part of optical instruments. + +##### Physical principle + +* uses the **phenomenon of reflection**, described by the law of reflection. + +##### Constitution + +* Usually plane or curved (spherical for the most simple to realize, +parabolic or elliptical) **surface, highly polished** so that its surface +state deviates from its theoretical form of less than $`\lambda/10`$ at each point +of its surface ($`\lambda`$ being the wavelength in vacuum of the light to be reflected). +To increase the reflectivity of the mirror (percentage of reflected light +intensity per the total of the incident light intensity), the surface is +**most often metallized**. + +##### Interest in optics + +* **One of the most importante simple optical component** that is used *alone or +* combined in a series in most optical instruments* : some telephotos, +* reflecting telescopes. + +#### Why to study plane and spherical mirrors? + +* **Plane and spherical mirrors** are the *most technically easy to realize*, +so they are the *most common and cheap*. +* In paraxial optics, the optical properties of a **plane mirror** are those +of a *spherical mirror of infinite radius of curvature*. +Plane mirror, concave and convex spherical mirror + + +