Geometrical Optics — three ways to learn it.

The complete written lesson — straight-line light & shadows, laws of reflection, plane & spherical mirrors with the mirror formula, Snell's law & apparent depth, total internal reflection & optical fibres, lenses & power in dioptres, the eye & its defects, magnifier & telescope, and the convex-lens board practical with worked numericals.

As you scroll, a live panel animates every idea: the incident ray sweeps with a live i = r readout, an object slides along a concave mirror's axis rebuilding its image, light bends at a water surface with Snell's law computed live, a ray sweeps past the critical angle into an optical fibre, and a spectacle lens cures a blurry eye.

Hands-on apparatus on a safe, virtual bench — including the optical-bench practical of finding a convex lens's focal length. All of the course's physics apparatus lives here.