World 1 · Reflection & Refraction · 8 minWorld 1 Review
Reflection and refraction, together
Teaching this? Open projector mode
You now have the two core tools of ray optics: reflection (θᵢ = θᵣ) at mirrors and refraction (Snell’s law) at boundaries. Everything that follows — lenses, prisms, telescopes — is these two rules applied again and again.
Check yourself
A ray meets an air–glass surface 30° from the normal. Part of it reflects and part refracts into the glass (n = 1.5). Which ray still makes 30° with the normal?
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