Where must the angle of incidence and angle of refraction always be measured from?
The normal (the imaginary line at 90 degrees to the boundary).
The refracted ray (the transmitted ray beyond the boundary).
The boundary (the surface separating the two materials).
The incident ray (the incoming ray approaching the boundary).
Flashcards for Edexcel A Level Physics Refraction and total internal reflection, covering the key terms, definitions and equations you need to recall for Paper 1, Paper 2 and Paper 3. 21 cards, matched to the Edexcel A Level Physics (9PH0) specification.
