Tuesday, March 27, 2012

D. Goldsberry 3/28/12

1. Complete Warm-Up for March 28th.

2. Get your journal ready – we will

complete our notes on Color and

Vision today

3. Time Limit: 8 minutes

D. Goldsberry 3/28/12

1. An element is located in the periodic table according to

A. when it was discovered.

B. its chemical symbol.

C. its chemical name.

D. its physical and chemical properties.

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D. Goldsberry 3/28/12

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5. Are the properties of

sodium, Na, more like the properties

of lithium, Li, or magnesium, Mg?

Explain your answer.

D. Goldsberry 3/28/12

S8P5:

Students will explore the

wave nature of sound and

electromagnetic radiation.

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a. Identify the characteristics of electromagnetic

and mechanical waves.

b. Describe how the behavior of light waves is

manipulated causing reflection, refraction

diffraction, and absorption.

c. Explain how the human eye sees objects and

colors in terms of wavelengths.

d. Describe how the behavior of waves is affected

by medium (such as air, water, solids).

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What are the three visible

light wavelengths detected

by the human eye?

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Even though the visible spectrum

consists of seven different colors, all of

the color seen by the human eye is a

mixture of the three primary colors:

red, green, and blue.

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Red, green, and blue are the primary

additive colors. When mixed together in

different proportions, you can make just

about any color. When mixed in equal

proportions (added together), the three

primary colors yield white light.

http://www.micro.magnet.fsu.edu/primer/java/scienceopticsu/light/additive

.htmlD. Goldsberry 3/28/12

A pigment is a colored material that

absorbs some colors and reflects

others. The primary pigments are:

1. magenta

2. yellow

3. cyan

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Cyan, Magenta, and Yellow are the primary

subtractive colors. These colors are

combined to produce print media and

photographic film. When the subtractive

primary colors magenta, cyan, and yellow are

added together, they form the color black.

http://www.micro.magnet.fsu.edu/primer/java/scienceopticsu/light/s

ubtractive.html

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D. Goldsberry 3/28/12

When light enters your eye, it is focused

on a special “screen” at the back of the

eyeball. This screen is called the retina.

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It is made up of two different types of nerves

cells, rods and cones. The rods are sensitive to

dim light and are useful for night vision. Cones are

useful during the daylight and they help to

distinguish color because they absorb a different

range of wavelengths. D. Goldsberry 3/28/12

There are three types of cones:

1. Red cones – absorb mostly red and yellow

2. Green cones – absorb mostly yellow and

green

3. Blue cones – absorb mostly blue and violet

D. Goldsberry 3/28/12

Examples:

When you look at white T-shirt, all three

cones are stimulated

When you look at blue jeans, only the blue

cone is stimulated

When you look at a yellow shirt, both red

cones and green cones are stimulated

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Color blindness occurs because one or

more sets of cones do not function

correctly.

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Blind Spot Activity

Instructions

1. To find your blind spot, take a piece of paper and draw a small

X on the right side

2. Now, take your ruler and measure about 5 inches to the left of

the X.

3. Draw a dot there about the size of a penny.

4. Hold the paper in front of you and close your right eye. Look at

the X. Even though you're looking at the X you should be able

to see the dot out of the corner of your eye.

5. Slowly move the paper in front of you. Try moving it left and

right or closer and farther away. Remember to keep looking at

the X. At a certain point, the dot will seem to disappear out of

the corner of your eye.

D. Goldsberry 3/28/12

Blind Spot ActivityExplanation

Here's the science scoop on why this works: On the back of your eye, your

retina, you have cells called rods and cones that catch light and send

messages to your brain along your nerves, which are like wires. All your

nerves go through your retina in just one spot. In this spot, there are no

rods and cones. Since you don't have any rods and cones there to catch

light, you can't see with that part of your eye. The reason you don't notice

your blind spot is because your brain fills in that part of your vision with

what it thinks should be there. So when the dot goes into your blind

spot, your brain fills in that space with the color of your paper because

that's what surrounds it. How big is your blind spot? Will the dot still

disappear if it's as big as a quarter? How about if it's a different shape, like

a square or a star?

From PBSKids--

http://player.discoveryeducation.com/index.cfm?guidAssetId=3c75a3fc-

4fdc-4adc-883d-21a0b477f299D. Goldsberry 3/28/12

Wave Interactions

LAB

We will need to form five (5) teams

to conduct this lab.

We will work quietly in the hallway.

The lab is due at the end of class.D. Goldsberry 3/28/12

1. What is the longest color the human

eye can detect?

2. What is the shortest color the human

eye can detect?

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3. If a white piece of paper and a black

piece of paper is placed in a blue

light, what color will you see on the

papers?

4. If a green leaf and a red apple are

placed in a green light, what color will

you see when you look at the leaf and

apple?D. Goldsberry 3/28/12

5. What is the name of the nerve cells

(on the retina) that detect color?

6. Name the three colors the color nerve

cells can detect.

D. Goldsberry 3/28/12