In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Example Input: Question: Ron was playing with a flashlight. He moved it back and forth slowly, and then quickly. Which motion likely caused more light to bend? 
 Answer: the quick motion
Example Output: In refraction of light, the greater the change in speed, the more light bends.

Example Input: Question: If Ben wants to see a far away star, he should use a telescope with a 
 Answer: larger lens
Example Output: The larger a telescope's mirror or lens, the better it is at seeing narrowly separated objects as individual objects and the sharper the images look.

Example Input: Question: Stretching a rubber band out _____ its elastic potential energy. 
 Answer: increases
Example Output:
The farther the object is stretched or compressed, the greater its elastic potential energy is.