Shedding new light on oil slick rainbows and other thin film physics

Shedding new light on oil slick rainbows and other thin film physics

This microscope image shows rainbow colors in a flat sheet of layered liquids. Credit: David Hoffman/SLAC National Accelerator Laboratory When sunlight reflects off an oily puddle in a parking lot, it creates a swirling rainbow of colors. This is because of the thin film interference principle, which explains how light reflects off different layers, or …

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