The colors in the soap bubble are due to:
Correct answer: A. Interference
- A. Interference
- B. Dispersion of light
- C. Scattering of light
- D. Refraction of light
Explanation
The colors in a soap bubble are due to interference of light. When light reflects off the outer and inner surfaces of the thin soap film, the waves overlap and interfere. This interference can be constructive or destructive, depending on the thickness of the film and the wavelength of light, creating the observed spectrum of colors. Other phenomena like dispersion, scattering, and refraction are unrelated to this scenario: dispersion involves splitting light into colors through a medium like a prism, scattering is light deflection by particles, and refraction is bending of light between different mediums.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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