Light

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.

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).

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.

Light• Light 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.

Light

• Light travels in a straight line. The path the light takes is called a ray.

Light

• Light 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.

Light

Pictures courtesy of Micro soft clip art