diff --git a/12.temporary_ins/70.wave-optics/20.diffraction/diffraction-2D-rectangular-direction.jpg b/12.temporary_ins/70.wave-optics/20.diffraction/diffraction-2D-rectangular-direction.jpg
new file mode 100644
index 000000000..e2d4592ca
Binary files /dev/null and b/12.temporary_ins/70.wave-optics/20.diffraction/diffraction-2D-rectangular-direction.jpg differ