A single mode step index fibre has a core of about _ um diameter
Correct answer: D. 5
- A. 50 to 1000
- B. 50
- C. 30
- D. 5
Explanation
A single mode or monomode step index fibre allows the propagation of only one transverse electromagnetic mode and hence the core diameter must be of the order of 2 µm to 10µm.
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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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