14.4 color and polarization pp. 543 - 548 mr. richter
TRANSCRIPT
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14.4 Color and Polarizationpp. 543 - 548
Mr. Richter
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Agenda (Today and Tomorrow
Review Homework
Introduction to Color
Notes: Color Color and Light Color and Pigment Polarization
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Objectives: We Will Be Able To…
Recognize how additive colors effect the color of light.
Recognize how pigments affect the color of reflected light.
Explain how linearly polarized light is formed and detected.
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Warm-Up:
Leaves are green. What makes them green? That is, why do we perceive them to be green?
Discuss at your table and we will discuss as a class in a few minutes.
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Color
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Introduction to Color
The color of an object appears different depending on the lighting conditions. Think about what you look like under
a black light. Or some jerk’s sunglasses.
The color of an object depends on which wavelengths of light shine on
the object, and which wavelengths are reflected.
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Color
Remember, white (visible) light is a combination or red, orange, yellow, green, blue and violet.
These colors each have different wavelengths red = ~700 nm violet = ~400nm
When light hits an object, some wavelengths are absorbed, and some are reflected.
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Color
An object will appear to be the color of the light that it reflects.
Green leaves appear green because they absorb all wavelengths of light except green, which they reflect.
If a red light shines on a green leaf, what color will the leaf appear to be? Black!
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Color
Green objects only reflect green light.
When white light shines on green objects (white light contains green), green light is reflected
When red light shines on green objects (red light contains no green), the light is absorbed, and the object appears black.
What color does the leaf appear if green light shines on it? Green, of course!
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Color and Light
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Color and Light
A prism breaks up light into six (or seven) distinct colors.
These beams of light cannot be further broken up, but they can be put back together.
If we add two colors of pure light together, we can create new colors.
This is not the same as mixing pigments!
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Color and Light
The three primary colors of light are red green and blue
When two of these colors combine, they create a secondary color
red + green = yellow red + blue = magenta blue + green = cyan
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Color and Light (fun facts)
The human eye can only detect the primary colors of light: red, blue and green. Everything else is a
combination of those colors.
Visual screens like monitors and TVs only have red, blue and green pixels. The brightness of each pixel
contributes to the overall picture color.
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Color and Light: Your Turn
A substance is known to reflect green and blue light.
What color would it appear to be when it is illuminated by the following colors of light?1. white light
2. blue light
3. magenta light
4. red light
1) cyan, 2) blue, 3) blue, 4) black
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Day 2
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Warm-Up
If pure yellow light shines on a magenta t-shirt, what color will the t-shirt appear to an observer?
Yellow light = green + red light
Magenta = reflects red + blue
Yellow shining on magenta reflects only red light
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Agenda
Warm-Up
Upcoming Schedule/Exam
Notes: Color and Pigment Polarization
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Upcoming Schedule
Today: Finish 14.4
Tomorrow: Ch. 14 Review
Friday: Ch. 14 Test (No Quarterly Exam)
Next Week: Refraction!
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Color and Pigment
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Color and Pigment
When colors of light are mixed, they are additive. Yellow light (red + green)
mixed with blue light all combine to form white light.
When colors of pigment are mixed, the result is different.
Yellow pigment mixed with cyan pigment creates green. Why?
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Color and Pigment
When colors of pigment mix, they are subtractive.
Each pigment (like a paint color) only reflects certain colors of light.
The more pigments are mixed, the less light is reflected back.
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Color and Pigment
The primary pigment colors are: cyan yellow magenta
Just like a printer cartridge.
All other pigments are formed from combinations of these pigments.
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Polarization
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Polarization
Light from most sources has electric and magnetic fields that oscillate at all random angles. Vertical, horizontal, , etc.
This light is said to be unpolarized.
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Polarization
Light is polarized when the all of the electromagnetic waves are transmitted at the same angle. Everything is aligned.
The vibrations of the electric and magnetic fields are parallel to each other.
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Polarization
Light can be polarized in two ways:
Transmission: a polarizer (good word!) allows only waves of a certain angle to pass through. Kind of like a picket fence.
Reflection: most waves of light bouncing off of a surface are polarized parallel to that surface Like glare off of glass or other shiny
objects.
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Polarization: Applications
Most light we see that is polarized due to reflection is horizontally polarized. Parallel to snow covered ground,
car hoods, lakes, etc.
Glasses and goggles are polarized vertically to block this glare. Like adding a horizontal picket
fence.
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Wrap-Up: Did we meet our objectives?
Recognize how additive colors effect the color of light.
Recognize how pigments affect the color of reflected light.
Explain how linearly polarized light is formed.
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Homework
p. 548 #1-4
p. 552 #37-39, 41
Chapter 14 Test Friday