diff --git a/12.temporary_ins/65.geometrical-optics/50.simple-elements/10.dioptre/20.overview/thin-spherical-surface-1.png b/12.temporary_ins/65.geometrical-optics/50.simple-elements/10.dioptre/20.overview/thin-spherical-surface-1.png
new file mode 100644
index 000000000..a29a08270
Binary files /dev/null and b/12.temporary_ins/65.geometrical-optics/50.simple-elements/10.dioptre/20.overview/thin-spherical-surface-1.png differ