Objective: SWBAT determine how a material is impacted when light is reflected or transmitted by using a model in order to construct an explanation
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Exit Ticket Review:
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Question 1
1.
What do you notice about the wavelengths of each wave below? How might you experiance the waves differently?
Guided Notes:
How do you think the color white is created?
How do you think the color black is created?
What Eyes Can See
Look around. You might see a desk, your friend, maybe an apple. Are you really seeing those things? What you are actually seeing is light bouncing off the objects around you.
Light carries energy. When light hits a material, three different things can happen: the material can absorb the energy (take it in), transmit the energy (let it pass through), or reflect the energy (cause it to bounce off).
Depending on the material and the types of light hitting it, all three things can happen at once.
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Question 2
2.
How do you see color and light around you?
Depending on the wavelength of the light, different signals are sent to the brain. We perceive different signals as different colors.
So your eyes are actually seeing light. Still, this does not explain why you see certain objects as certain colors. For instance, why are some apples green and other apples red? Red apples look red because they reflect red light.
The energy from red light is not absorbed by the apple; it bounces off instead. When you look at the apple, reflected red light waves hit your eye and are absorbed. The process is the same for green apples, except green apples reflect green light instead of red light.
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Question 3
3.
Describe how light travels.
What about when you look at something black, like a crow, or something white, like an egg? People usually think of black and white as colors, just like red. To your eyes, however, black and white are different from the colors of the rainbow. Black is what we see when no visible light is reflected off an object. Black objects don’t reflect any visible light because they absorb all types of visible light. Taking in energy from so many different types of light can make black clothes feel hot and uncomfortable on sunny days.
White, on the other hand, is what we see when all colors of visible light reflect off an object. White objects reflect all types of visible light. White clothes are great for staying cool on a sunny day because they don’t absorb any energy from visible light.
If black is the absence of color, what about things that appear to have no color, like a clear piece of glass? Clear glass seems to have no color of its own, but it isn’t black, either. When you look through a piece of clear glass, you see the colors of objects on the other side. This is because clear glass transmits all types of visible light. When these light waves hit a pane of glass, they pass right through, carrying their energy across to the other side. Through a clear glass window, you see a world full of colorful objects, each of which is reflecting certain wavelengths of light through the glass to your eye.
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Question 4
4.
Why do eggs appear white?
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Question 5
5.
How is it that humans see the color black?
"Black is seen when all light is (absorbed/reflected/transmitted) off an object."
Practice:
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Question 6
6.
Draw vector lines on each of the types of visible light to indicate the color changes on the following objects.
Draw an orange cat.
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Question 7
7.
Draw vector lines on each of the types of visible light to indicate the color changes on the following objects.
Draw a green and yellow snake.
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Question 8
8.
Draw vector lines on each of the types of visible light to indicate the color changes on the following objects.
Draw a green bear.
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Question 9
9.
These graphs show the wavelength and amplitude of light coming from three lasers. Could any of these lasers be giving off different types of light?