🌈 Refraction of light

Unit 3 · Forces, energy & reactions · 8 min

When light passes from one medium to another (air into water), its speed changes and it bends: refraction. That's why a pencil in water looks broken. Glasses and camera lenses rely on refraction.

Words in this lesson

• 折射 (zhé shè) — refraction
• 镜头 (jìng tóu) — lens

Project: Put a pen in a glass of water, photograph it from the side and draw rays to explain.