1. EQ: How does light interact with matter?
Light and Color
EQ: How does light interact with matter?

2. EQ: How does light interact with matter?
Light and Matter
Three ways light interacts with matter
Reflection
Absorption
Transmission
Example – Window
You can see objects outside because light is transmited through the glass
EQ: How does light interact with matter?

3. EQ: How does light interact with matter?
Transmission
Passing of light through matter
Transmission of light occurs all the time, through air
EQ: How does light interact with matter?

4. EQ: How does light interact with matter?
Example – Window
You can see objects outside because light is transmitted through the glass
You can see the glass and your reflection in it because light is reflected off the glass
The glass feels warm when you touch it because some light is absorbed by the glass
EQ: How does light interact with matter?

5. EQ: How does light interact with matter?
Vocabulary
Transparent – a material that transmits light. Light passes through it allowing you to see what is on the other side
EQ: How does light interact with matter?

6. EQ: How does light interact with matter?
Translucent
A material that scatters light as it passes through it. Only some light passes through the material
EQ: How does light interact with matter?

7. EQ: How does light interact with matter?
Opaque
A material that reflects or absorbs all of the light that strikes it. You cannot see through it
EQ: How does light interact with matter?

8. EQ: How does light interact with matter?
How do we see color?
We see different wavelengths of light as different colors
Long wavelengths as red
Short wavelengths as violet
Certain combinations of color like pink and brown are seen when certain combinations of wavelengths are present
EQ: How does light interact with matter?

9. EQ: How does light interact with matter?
Color of an Object
The color that an object appears to be is determined by the wavelengths that reach your eye
Light reaches your eye after being reflected or after being transmitted through an object
Your brain interprets the color
EQ: How does light interact with matter?

10. Colors of Opaque Objects
When white light strikes an opaque object, some colors are absorbed and some are reflected.
Only the reflected light reaches your eyes and is detected
The color of light reflected by an opaque object determine the color you see.
EQ: How does light interact with matter?

11. Colors of Transparent and Translucent Object
When you look through colored transparent or translucent objects, you see the color of light that was transmitted through the object. The other colors were absorbed
EQ: How does light interact with matter?

12. EQ: How does light interact with matter?
Mixing Colors of Light
Primary colors of light
red, blue, green
when these three colors of light are mixed the light appears white
EQ: How does light interact with matter?

13. EQ: How does light interact with matter?
Color Addition
Combining colors of light
Secondary color of light
When two primary colors of light are combined
Cyan = blue + green
Magenta = blue + red
Yellow = red + green
EQ: How does light interact with matter?

14. Light and Color Television
Color tv is produced by color addition of the primary colors of light
TV screen made up of tiny dots of red, blue and green
Each dot glows when hit by an electron beam
The colors given off by the glowing dots add together to produce all the colors on the screen
EQ: How does light interact with matter?

15. Mixing Colors of Pigment
Pigment – a material that gives a substance its color by absorbing some colors of light and reflecting others
Almost everything contains pigment
Chlorophyll – plant pigment
Melatonin – gives us our skin color
EQ: How does light interact with matter?

16. EQ: How does light interact with matter?
Color Subtraction
Mixing pigments is called color subtraction
Primary pigments: yellow, cyan, and magenta
They can be combined to produce any color
Every color in your book was produced by using the primary pigments and black ink (used for contrast)
EQ: How does light interact with matter?

17. Class Work and Homework
EQ: How does light interact with matter?
Fill In
What did I learn
Confused
Say
Read the passage online “Light and Color”
Answer questions 1-11 Section Review