Agirl enters a dark room and cannot see anything. she turns on the light and sees her pet cat. why did the girl see the cat only when the light was on?

the human eye cannot see anything when its too dark

explanation:

the human eye cannot see anything when its too dark, light is required to visualize things by human eye that's why she couldn't see her cat when it was dark and she had to turn on lights to see her cat

answer: i would say the brain but it seem that you have a brain.