Yet it is just one of the many forms of electromagnetic radiation, from radio waves to cosmic rays. Light is simply the one form of radiation our eyes can see. Light on the water Light bounces off the surface of the water, giving an almost perfect reflection of a fisherman and his rod. The reflection shimmers as the water moves, reflecting light at different angles.
Refraction appears to bend the float where it is visible beneath the water.
What makes things visible Although we are surrounded by light during the day, few things give out light. The Sun and the stars, candles, electric lights, luminous watches and glow worms are all light sources. Most things you see only because they reflect light from light sources. If things do not emit or reflect light, they are invisible, like air. Look at laser beams piercing the night and you can see that light travels in straight lines.