0framistan 6 years ago ReplyUpvoteTake a flashlight and 2 magnifying glasses. Go outside at night with the 3 items and hold the magnifying glasses in front of the flashlight. See how far away you can send the beam of light down the street. If you are a geek, this will entertain you for at least an HOUR! ... then you may start asking yourself some QUESTIONS.... Can the beam be detected at the other end with a solar cell? Can the beam be MODULATED using a microphone, and sound transmitted on the beam? Will the solar cell detect the sound if i attach the solar cell to a small audio amplifier? If a person at the other end makes a similar light beam, can we talk 2 ways... or will the light beams interfere with each other??? Do the light beams have to be VISABLE light... or would INFRA-RED LED's work also??? There is no reason to be bored if you keep thinking and asking questions and building things that answer your questions.