The colour of thin films is a result of:
Correct answer: D. Interference of light
- A. Dispersion
- B. Absorption of light
- C. Scattering of light
- D. Interference of light
Explanation
The correct answer is interference of light. The colors seen in thin films result from the interference of light waves reflected from the top and bottom surfaces of the film. Depending on the thickness of the film and the wavelength of the incoming light, certain wavelengths constructively interfere, while others destructively interfere, creating the vivid colors observed. This is different from dispersion, absorption, or scattering, which do not account for the distinct color patterns seen in thin films.
This question appeared on the ETEA MDCAT 2016 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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