Then it could go from that transmitter to the other reciever. It formed a loop like this. This happens when light is moving in one material and comes to another with a smaller index of refraction . If it hits it at more than a certain angle it gets reflected back into the first material and stays there. In this way it can be directed kind of like water in a pipe.
Computers use different numbers than people.
We use the decimal system and they use the binary system . That's because each placeholder is in powers of twos instead of tens. Why that was important to us is that when our circuit was on, it sent a one to the computer. When its off it sent a 0 to the computer. When it gets a group of numbers, it converts them into a word.