How we worked it out
Updated as you change the numbers.
- n₁ sin θ₁ = n₂ sin θ₂. Critical angle = arcsin(n₂ ÷ n₁) when n₁ > n₂.
Method and assumptions
Angles are measured from the normal (perpendicular to the surface).
Questions
At what angle does light entering water at 30° bend?
About 22.02°.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.