The correct statement is:
"As light waves enter a different medium, they bend towards the normal if they slow down and bend away from the normal if they speed up."
This means that when light travels from a less dense medium (like air) to a denser medium (like water), it slows down and bends towards the normal line. Conversely, when light travels from a denser medium to a less dense medium, it speeds up and bends away from the normal.