Prism and Rainbow
Interactions
- Drag the prism to turn it on its stand: the spectrum moves, stops at the minimum deviation and turns back, or vanishes by total internal reflection
- Drag the sun up or down on the hill: the bow sinks or rises around the anti-solar point, then the sun drifts back
- Click the big raindrop: the incoming ray steps across it and the exit angle grows to 42° at the caustic and turns back