COLORS OF LIGHT AND AFTER-IMAGES

QUEStion

HYPOTHESIS:
White light = longest after-image It may appear the brightest (being the product of the 3 color cones in human eyes)

Procedure

Colored Paper

Flashlight

Procedure

• Dark room
• 1 meter away from set up
• Stare for 10 seconds
• Turn off light; measure time of after-image
• Record data for blue, red, green, white, black, and yellow
• 7+ trials
• Average and best-value found

Documentation

Results

Results (Data Table)

Results (Graph)

Results (Patterns)

• Longest to shortest after-image: White, yellow, green, blue, red, and black
• Blue, red, and black have similar times
• White has the greatest time, with a separation of 70 seconds

Conclusion

• Hypothesis was accepted
• White = Longest after-image
• Order from longest to shortest after-image: White, Yellow, Green, Blue, Red, Black
• After-images = Optical illusion caused by straining in rods & cones
• White is most intense; more straining & longer after-image

Conclusion cont.

• Electromagnetic wave properties
• ROYGBIV (Lowest to highest wave frequency & longest to shortest wave length)
• Longer wave length (low) = Longer after-image
• Red is an outlier
• Pattern suggests orange, indigo, and violet MIGHT follow this pattern

Procedure Evaluation

• Controlled lighting, subject, and color material
• Unbiased subject
• Test red again; Along with other colors
• Use plastic slates
• Remote controlled light
• More trials are always helpful

Untitled Slide

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