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.
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Question: Question: If Mona shines a light through both wool and cotton and determines that cotton is more dense then wool, which material will the light move faster through? 
 Answer: wool

Answer: The more dense the medium, the slower the light moves.


Question: Question: When a rubber band is relaxed, its elastic force 
 Answer: decreases

Answer: The elastic force increases the more the material is stretched or compressed.


Question: 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

Answer:
In refraction of light, the greater the change in speed, the more light bends.