What do we know about light? Light and Color

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

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

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

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

Light passes through objects in varying amounts. Transparent Translucent Opaque

What happens when light hits an object?

Light refracts.

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

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

Peacock Feather Micro-lamellae CD micro- structure

Show students the set up for the investigation of light.

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

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

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.

Credit to Rory Gates 10 years old

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

Light travels in straight lines.