Two-dimensional ripple tank. Click anywhere to drop a source. Drag a source to move it. Switch to double-slit for Young's original setup: a plane wave through a barrier with slits.
42
22
55
ink
8
60
45
click add source · drag move source shift+click remove source P palette · space pause · R reset M toggle double-slit · in that mode 1/2/3 sets slit count