light. light is essential for life. we need light to survive. we need light to see. we use light as...
TRANSCRIPT
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 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.