The principle of thin film is based on:
Correct answer: B. Division of wavelenght
- A. Reflection of light
- B. Division of wavelenght
- C. Refraction of light
- D. Division of amplitude
Explanation
The principle of thin film interference is based on the division of wavelengths of light. When light passes through a thin film, such as a soap bubble or an oil slick, it gets reflected and refracted. This causes constructive and destructive interference, resulting in different colors observed. The thickness of the film determines which wavelengths of light interfere constructively or destructively, leading to the colorful patterns we see. It's a beautiful phenomenon.
This question appeared on the KMU Centralized Admission Test 2020 paper, which you can sit online with every answer explained.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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