1. Light and Color

2. Light and Matter Objects can absorb, reflect and transmit light Opaque
Only absorbs and reflects light
No light passes through

3. Light and Matter Translucent Transparent
Allows some light to pass through
Transparent
Allows most light through
Absorbs and reflects very little light

4. Reflection of Light Reflection Law of Reflection
Light strikes an object and bounces off
Law of Reflection
Angle of incidence (striking the object) is equal to angle of reflection (bouncing off the object)

5. Reflection of Light Regular reflection Diffuse reflection
Smooth surfaces produce sharp images
Diffuse reflection
Very uneven surfaces produce diffuse reflection
Most surfaces are rough and produce diffuse reflection

6. Refraction of Light Refraction Bending of light waves
Caused from a change in speed
Larger index of refraction, the more light has slowed down

7. Refraction

8. Refraction of Light Prisms Separates light into different colors
Amount of bending is caused by wavelength
Red bend the least
Violet bend the most

9. Refraction of Light
Rainbows
Raindrops acts as a prism

10. Refraction of Light

11. Refraction of Light Mirage
Image of a distant object produced by the refraction of light
Occurs because of different densities of air layers
Light travels faster in warm air
Slower in cool air

12. Mirage

13. Light and Color White light is a blend of all colors of spectrum
ROY G BIV
Red objects appear red because it reflects red and absorbs all other colors
Green reflects green and absorbs all other colors

14. Light and Color Black Is not a color present in visible light
Absorb all colors of the light spectrum
Reflects little to no light back to our eyes

16. Colored Filters Filters
Transparent material that transmits one or more colors of light but absorbs all other
Color of filter is color of light it transmits
Color Filters

17. Mixing Colors
Pigment
Colored material used to change color of other substances
Examples
Paint
Dyes

18. Mixing Colored Lights Primary Colors of Light Red Green Blue
Mix these 3 in equal amounts, produces white light
Mix in different proportions, all the colors we see
Color Vision

19. Paint Pigments
Mixing paint is different than mixing colors of white light
Paints are made from colored pigments
3 primary pigments
Magenta (bluish-red)
Cyan (greenish-blue)
Yellow

20. Primary Pigments Mixing three primary pigments produces black
Known as subtractive colors

21. Color and Vision Retina Rods Cones Area on the inside of your eyeball
Made of cone and rod cells
Rods
Sensitive to dim light
Night vision
Cones
Allows us to see color and detailed shapes

22. Cones 3 types of cones Red Green Blue Sensitive to red and yellow
Sensitive to yellow and green
Blue
Sensitive to blue and violet

24. Colorblindness Colorblindness
Caused by one or more sets of cones not functioning correctly
Can see color but can’t distinguish between certain colors

25. Color Blindness
Vision simulator

26. Producing Light Incandescent Lights
Produces light by heating piece of metal until it glows
Tungsten
Used in most homes

27. Producing Light Fluorescent Lights Bulbs filled with gas
Inside bulb coated with phosphorus
Electrons collide with gas and emit ultraviolet radiation
Phosphorus absorb this radiation and give off light

28. Producing Light
How fluorescent light bulb works
Very energy efficient

29. Producing Light Neon Lights Work similar to fluorescent bulbs
Tubes filled with gas (usually neon)
Other gases produce different colors

30. Producing Light Sodium-Vapor Lights
Used for streetlights and outdoor lighting
Tube contains mixture of argon gas, neon gas and sodium metal
Emits yellow-orange glow

31. Producing Light Tungsten-Halogen Lights
Used to create very bright light
Tube filled with tungsten filament and a halogen gas
Gas caused filament to get very hot