🔦 Ray Optics — one ray, three things light does at a surface
A single beam meets a mirror, a glass slab and a prism. Bounce, bend and split — change the angle of incidence i and watch all three respond together.
Step 1 — the incident ray at each station, with the dashed normal. Note the angle i.
mirror: reflection 40° = i ·
glass: bends to 25°
prism: white light splits into a spectrum (dispersion)