Key term for Edexcel GCSE Physics, used in Light, Lenses and Reflection.
The specific angle of incidence that results in an angle of refraction of exactly 90° along the boundary.
Critical angle (c) appears in Edexcel GCSE Physics revision content for Light and the electromagnetic spectrum, especially Light, Lenses and Reflection and Ray Diagrams and TIR.
Create a free account to access Edexcel GCSE Physics revision notes, track progress, and practise related key terms.
