appearance of colour in thin films is due to ____________________?
Correct answer: C. interference
- A. diffraction
- B. dispersion
- C. interference
- D. polarization
Explanation
Colours in a thin film arise from interference between light reflected from the upper and lower surfaces of the film. Different wavelengths undergo constructive or destructive interference at different viewing conditions. Students may choose dispersion because a range of colours is seen, but dispersion separates colours by refractive index rather than by interference.
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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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