Which one of the following lights travels fastest in optical fibers?
Correct answer: D. Invisible infrared light
- A. Visible light
- B. Ultraviolet light
- C. Ordinary light
- D. Invisible infrared light
Explanation
Infrared light travels fastest in optical fibers due to its longer wavelength, which minimizes scattering and absorption. This allows it to pass through gases and dust with less interference compared to other types of light. Visible, ultraviolet, and ordinary light all encounter more scattering and absorption, which slows them down in optical fibers.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Optics
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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