Final answer:
Vertical shrink by a factor of 1/2 refers to reducing the vertical size by half.
Step-by-step explanation:
Vertical shrink by a factor of 1/2 refers to reducing the vertical size by half. This means that the height or length of an object or wave is decreased by half compared to its original size. For example, if a wave has a length of 10 units, after a vertical shrink by a factor of 1/2, the length would become 5 units.