Refraction

This is the story of two friends- a boy and a girl. One day girl asked the boy, “Can you do me a favor?” “Sure. What is it?” Boy replied. The girl looked at him and said, “I want you to perform four simple tasks for me.” Now, Boy was curious to know those tasks and he said, “Well, Tell me. I’ll try my best.” The girl continued, “You have to repeat the same task four times, but at different locations and whenever I ask you to do so.” “What is the task?” Boy asked. The girl answered, “To complete the task, you will require a bucket full of water. I’ll provide you a map, which will have a path that you need to follow. Once you reach the destination, you will see a tree. And the task will be complete when you water that tree.” The boy was surprised. He accepted the task. Next day, Girl gave a map to the boy. The map was very easy to understand but the path shown was very long and it was passing through a jungle. The boy had never been to that place before. The boy follow