Physics for IGCSE & O level - Rays And Waves (Section 3 - No. 14)
What is total internal reflection?
When all the light is reflected at the boundary of a medium
When all the light is refracted at the boundary of a medium
When some light is reflected and some is refracted.
When no light is reflected
הֶסבֵּר
Total internal reflection is when all light is reflected internally.