Physics for IGCSE & O level - Rays And Waves (Section 6 - No. 49)
What happens to light at the boundary between two media with different refractive indices?
It always reflects.
It refracts.
It may undergo total internal reflection.
It travels in a straight line.
הֶסבֵּר
Light can refract, and undergo total internal reflection. Reflection also can take place.