1. What do we know about light?
Light and Color

2. Light travels in straight paths:
Properties of Light
Light travels in straight paths:
Laser

3. Light travels VERY FAST- around 300,000 kilometers per second.
At this speed it can go around the world 8 times in one second.

4. Light travels much faster than sound.
Thunder and lightning
start at the same time,
but we will see the lightning
first.

5. We see things because they reflect light into our eyes:
Homework

6. Light passes through objects in varying amounts.
Transparent
Translucent
Opaque

7. What happens when light hits an object?

8. Light refracts.

11. This slide is grouped so that you can move it around.

12. What color is reflected?
Does the color
seem to change where
it is when the light
moves?
Pigment or
Iridescence?
Fabric Square #1 #2 #3 CD
Feather #1
Feather #2
Black Square

13. Peacock Feather
Micro-lamellae
CD micro- structure

14. Show students the set up for the investigation of light.

15. Reflection from a mirror:
Normal
Incident ray
Reflected ray
Angle of incidence
Angle of reflection
Mirror

16. When a ray of light is reflected from a
Law of Reflection
When a ray of light is reflected from a
smooth surface, the angle of reflection
is equal to the angle of incidence.
Normal Line
This slide is animated.
Incident ray
Reflected ray

24. The rainbow colors shown here represent the concentrations of chlorophyll (in milligrams per cubic meter) at or near the surface of the ocean. Chlorophyll is the pigment found in phytoplankton that gives them their green color. (Like land plants, phytoplankton use chlorophyll for photosynthesis.) Scientists use MODIS data to determine how much of the light at certain visible wavelengths is reflected from the surface of the ocean and how much is absorbed. Because chlorophyll absorbs incoming visible light, scientists can use the comparison of absorbed versus reflected light to estimate the abundance of chlorophyll.

25. Credit to Rory Gates 10 years old

26. Light reflects-we see things because they reflect light into our eyes.

27. Light travels in straight lines.