Physics for IGCSE & O level - Rays And Waves (Section 4 - No. 41)
What is a crucial characteristic of the critical angle?
The angle of reflection is 90 degrees.
The angle of refraction is 90 degrees.
The light is absorbed.
The light is not reflected.
הֶסבֵּר
The angle of refraction is 90 degrees at the critical angle.