In a thin film of soap, which color appears at the center of the pattern due to destructive interference? (2023)

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Q: In a thin film of soap, which color appears at the center of the pattern due to destructive interference? (2023)

Solution: At the center, destructive interference occurs for red light due to its longer wavelength.

Steps: 5

Step 1: Understand that a thin film of soap can create colorful patterns due to light interference.
Step 2: Know that light waves can interfere with each other in two ways: constructive interference (where they add up) and destructive interference (where they cancel each other out).
Step 3: Recognize that different colors of light have different wavelengths, with red light having a longer wavelength compared to other colors.
Step 4: At the center of the soap film, the conditions are such that red light undergoes destructive interference, meaning it cancels out.
Step 5: Conclude that because red light is canceled out at the center, it is the color that does not appear there.