Commit 3518b856 authored by Claude Meny's avatar Claude Meny

Update cheatsheet.en.md

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...@@ -39,7 +39,7 @@ so they are the *most common and cheap*. ...@@ -39,7 +39,7 @@ so they are the *most common and cheap*.
of a *spherical mirror of infinite radius of curvature*. of a *spherical mirror of infinite radius of curvature*.
Plane mirror, concave and convex spherical mirror Plane mirror, concave and convex spherical mirror
![](plane-concave-convex-mirrors.png) ![](plane-concave-convex-mirrors.png)<br>
Fig. 1. a) plane b) concave c) convex mirrors Fig. 1. a) plane b) concave c) convex mirrors
#### Are plane and spherical mirrors stigmatic? #### Are plane and spherical mirrors stigmatic?
...@@ -57,13 +57,13 @@ Fig. 1. a) plane b) concave c) convex mirrors ...@@ -57,13 +57,13 @@ Fig. 1. a) plane b) concave c) convex mirrors
* coming from an object point generally do not converge towards an image * coming from an object point generally do not converge towards an image
* point (see Fig. 2.) * point (see Fig. 2.)
* *
![](spherical-mirror-rays-stigmatism-1000-1.jpg) ![](spherical-mirror-rays-stigmatism-1000-1.jpg)<br>
Fig. 2. Non stigmatism of a convexe mirror. Fig. 2. Non stigmatism of a convexe mirror.
![](spherical-mirror-rays-stigmatism-1000-2.jpg) ![](spherical-mirror-rays-stigmatism-1000-2.jpg)<br>
Fig. 3. But when we limit the aperture of the mirror, Fig. 3. But when we limit the aperture of the mirror,
![](spherical-mirror-rays-stigmatism-1000-3.jpg) ![](spherical-mirror-rays-stigmatism-1000-3.jpg)<br>
Fig. 4 . and limit the conditions of use to small angles of incidence and Fig. 4 . and limit the conditions of use to small angles of incidence and
refraction are small, then a point image can be defined : the mirror becomes refraction are small, then a point image can be defined : the mirror becomes
quasi-stigmatic. quasi-stigmatic.
...@@ -150,16 +150,16 @@ side* of the mirror.<br><br> ...@@ -150,16 +150,16 @@ side* of the mirror.<br><br>
* with **real objects** * with **real objects**
![](Thin-spherical-mirror-InfAC-1000.jpg) ![](Thin-spherical-mirror-InfAC-1000.jpg)<br>
Fig. 5. Concave mirror with object between infinity and C Fig. 5. Concave mirror with object between infinity and C
![](Thin-spherical-mirror-CAF-1000.jpg) ![](Thin-spherical-mirror-CAF-1000.jpg)<br>
Fig. 6. Concave mirror with object between C and F/F’ Fig. 6. Concave mirror with object between C and F/F’
![](Thin-spherical-mirror-FAS-1000.jpg) ![](Thin-spherical-mirror-FAS-1000.jpg)<br>
Fig. 7. Concave mirror with object between F/F’ and S Fig. 7. Concave mirror with object between F/F’ and S
![](Thin-spherical-mirror-InfAS-1000.jpg) ![](Thin-spherical-mirror-InfAS-1000.jpg)<br>
Fig. 8. Convex mirror Fig. 8. Convex mirror
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