Refraction of Light (Snell's Law)

Physics

$Labelled diagram: Refraction of Light (Snell's Law)$

Refraction of light at a boundary, showing the angles of incidence and refraction that give Snell's law.

Image: Oleg Alexandrov — I just tweaked the original · Public domain · Wikimedia Commons

Practise Physics past questions, with labelled diagrams like this one.