2 Light Light is essential for life. We need light to survive. We need light to see.We use light as a warning, such as flashing red lights or an emergency exit sign.
3 Light Light is an important source of heat. The Sun’s light (solar energy) is the main source of heat for Earth.Light from the Sun helps plants make their food (photosynthesis).
4 Light Another source of light is from light bulbs. Light bulbs allow us to see when there is no sunlight.Other light sources include fires, candles, flashlights, and lightning.
5 LightLight can be reflected (bounce off a smooth surface) or absorbed (taken in).Objects vary to the extent they absorb and reflect light energy.Sometimes, it bends when it passes through certain substances. This is called refraction.
6 LightLight travels in a straight line. The path the light takes is called a ray.
7 LightLight can be broken into colors (visible light) if a beam of light is passed through a prism or drop of water.The ray of colors appears in the same order: red, orange, yellow, green, blue, (indigo), and violet.
8 Pictures courtesy of Micro soft clip art LightPictures courtesy of Micro soft clip art