In a thin film interference, if the film is viewed in white light, which color will be seen at the center of the film? (2022)

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Q: In a thin film interference, if the film is viewed in white light, which color will be seen at the center of the film? (2022)

Solution: At the center of a thin film, constructive interference occurs for longer wavelengths (red light), making red the dominant color seen.

Steps: 5

Step 1: Understand that thin film interference happens when light reflects off the top and bottom surfaces of a thin film.
Step 2: Know that different colors of light have different wavelengths, with red light having a longer wavelength than blue light.
Step 3: Realize that at the center of the film, the path difference between the two reflected light waves is minimal.
Step 4: Remember that constructive interference occurs when the path difference is a multiple of the wavelength.
Step 5: Since longer wavelengths (like red) are more likely to constructively interfere at the center, red light will be the dominant color seen.