Color Lab
READ THE ENTIRE LAB AND COMPLETE THE PRE-LAB and ANYTHING ELSE NOTED BELOW IN YOUR NOTEBOOK. IF YOU DON'T HAVE IT COMPLETE, YOU WILL RECEIVE A 0 FOR THE LAB!
Question: What happens when you mix different colors of light? (Copy into your notebook.)
Purpose: (Copy into lab book)
1. To experiment with mixing different combinations of colored light. 2. Examine the effects of color filters on white light.
Background: All the colors of visible light can be created artificially using a combination of three primary colors, red, blue, and green. But how pure are these colors? Using diffraction glasses you will observe the LEDs to see the different colors of the spectrum that a light source produces.
Question: What happens when you mix different colors of light? (Copy into your notebook.)
Purpose: (Copy into lab book)
1. To experiment with mixing different combinations of colored light. 2. Examine the effects of color filters on white light.
Background: All the colors of visible light can be created artificially using a combination of three primary colors, red, blue, and green. But how pure are these colors? Using diffraction glasses you will observe the LEDs to see the different colors of the spectrum that a light source produces.
Pre-lab questions: (Answer in lab book)
- What are the three primary colors of light?
- What are diffraction glasses used for?
Materials: red, green, and blue LEDs, circuitry box, the white storage box, cardboard cutout with rectangle
Procedure:
Procedure:
- Attach the three LEDs to the circuitry box and plug in the whole assembly.
- Set the white storage box from the optics kit on its side at one end of the table. This is your screen.
- Place the red and blue LEDs next to each other and pointing toward the screen. Make sure the red LED is on the left and the blue is on the right. Place the green LED on the top (you may need to invert the green to make it work!).
- Place the cardboard cutout with the rectangle in the middle between the lights and the screen.
- Adjust the placement of the screen, cutout, and LEDS until you get a clear pattern. Take a photo of this pattern and upload it to Edmodo AND draw the pattern in your lab book!
Draw the following table in your lab book.
6. Using only the red & green LEDs, repeat steps 4 & 5. (Don't upload photos for the combinations in Table 1.) Fill in Table 1.
7. Repeat step 6 using the LED Color Combinations in Table 1.
Copy Table 2 into your lab book.
7. Repeat step 6 using the LED Color Combinations in Table 1.
Copy Table 2 into your lab book.
8. Examine only the red LED with the diffraction glasses.
9. Sketch what you see in the appropriate column of Table 2.
10. Repeat steps 8 & 9 for the green and blue LEDs.
11. Unscrew one of the color filters from one of the color LEDs. Examine the light produced by the white LED and record your observations in the table.
9. Sketch what you see in the appropriate column of Table 2.
10. Repeat steps 8 & 9 for the green and blue LEDs.
11. Unscrew one of the color filters from one of the color LEDs. Examine the light produced by the white LED and record your observations in the table.
Analysis: (Answer in lab book.)
- How many colors do you see in the light pattern on the screen?
- What color do you see when the red, green, and blue lights overlap?
- Compare the colors in the red LED to those in the green LED. What are the similarities and differences in the range of colors?
- Compare the colors in the green LED to those in the blue LED. What are the similarities and differences in the range of colors?
- How do the colors in the white LED compare to the red, green, and blue LEDs combined?
- The red LED consists of a white LED covered with a red filter. What does the red filter do?
- What do color filters do?
- If you wanted to get yellow light, what part of the spectrum would the color filter have to absorb?
Conclusion:
Write a paragraph (5-7 sentences) conclusion. What did you learn about mixing different colors of light and how would this be applicable to everyday life?
Write a paragraph (5-7 sentences) conclusion. What did you learn about mixing different colors of light and how would this be applicable to everyday life?