Light is important because it allows us to see. There are two types of light: natural light from the sun, moon, stars, and fireflies, and artificial light made by humans like candles and light bulbs. Light travels very fast in straight lines and can pass through some materials, like glass, while being blocked by others, like wood, causing shadows. When light interacts with materials it can be reflected, like in mirrors, or broken into a spectrum or colors, as seen in rainbows.

1. Light

2. Light
THNK:
Why is light important?

3. Light
• We see things every day, from the
moment we get up in the morning
until we go to sleep at night.
• We look at everything around us
using light.
• Without light, you wouldn't see
anything at all.
• There are two types of light: natural
light or artificial light.

4. Natural Light
• The most important source of natural
light is the sun.
• The sun gives the earth light and
energy.
• The moon and stars receive light
from the sun and reflects it to the
earth.
• A firefly also produces light.

5. Artificial Light
• Artificial light is light that is made
by people, or man-made.
• This includes candles, kerosene
lamps, flashlights, and light bulbs.

6. Light
• Light is a kind of energy that travels
in waves.
• Light can pass through some things,
but not others.
• Light travels very fast and in straight
lines.

7. Transparent
• An object that lets all light pass
through it is called transparent.
• These objects are transparent: clear
glass, eyeglasses, window, fish tank,
clear plastics, and transparent tape.

8. Translucent
• An object that lets some light pass
through it is called translucent.
• These objects are translucent:
waxed paper, sunglasses, frosted
glass, and thin fabrics.

9. Opaque
• An object that lets no light pass
through it is called opaque.
• These objects are opaque: rock,
metal, wood, fog, aluminum foil,
thick paper, and brick.

10. Shadows
• Shadows are caused
by opaque objects
blocking the path of
light.
• Long shadows are
seen in early morning
and late afternoon.
• Shorter shadows are
seen at noon.

11. Reflections
• Reflect is when light
or an image
bounces back off
an object’s surface.
• Light can bounce
back off an opaque
object.
• An image can
bounce back off an
object, such as, a
mirror, pond or lake,
or shiny metal.

12. More Reflections

13. Lightning
• Light travels faster than sound.
• That is why the lightning is seen
before the thunder is heard.

14. Rainbow
• A rainbow appears in the
sky when the sun shines
through droplets of water
in the air, creating a
spectrum of color.
• The white light is broken
up into many colors.

15. Spectrum of Color
• When you look at a light, it appears to be white.
• Light is made up of many colors. These
colors can be seen when light is broken up.
• There are seven colors of light in a spectrum:
red, orange, yellow, green, blue, purple, and
violet.
• These colors are always seen in the same
order.

16. Congratulations!
• You have learned that light is a
form of energy, light is made up of
many colors, and how light travels,
Let There Be Lots of
Light!

17. Resources