Simulations
Interactive, watermarked physics demonstrations — pick one to adjust its parameters and run it.
Double-Slit Interference
INTERSTELLARShine coherent light through two narrow slits and watch the exact bright/dark fringe pattern form on a screen — adjust wavelength, slit separation, slit width, and screen distance to see the fringes tighten, widen, and even lose whole orders to the single-slit diffraction envelope.
Locked — requires Interstellar →
Refraction (Snell's Law)
FREESend a light ray into the interface between two media — adjust the incidence angle and each medium's refractive index to see it bend according to Snell's law, or totally internally reflect once you pass the critical angle.
Open simulation →
Thin Lens (Image Formation)
ORBITPlace an object in front of a converging or diverging lens — watch the three principal rays trace out where the image forms, and see whether it's real or virtual, upright or inverted, magnified or reduced.
Locked — requires Orbit →