Question

The inner part of the fibre optics which carries light is called………………

Answer 1

Hint: In order to answer the question, we have to know about the construction of the fibre optics which is the science of transmitting data, voice, and images by the passage of light through thin, transparent fibers. Optical cables transfer data at the speed of light in glass. This is the speed of light in vacuum divided by the refractive index of the glass used.

Complete answer:
The fibre optics cable is made of three layers, viz. core, cladding and coating.The core, which carries the light, is the smallest and the most important part of the optical fiber. The optical fiber core is usually made of glass, although some are made of plastic.

The glass used in the core is extremely pure silicon dioxide $(Si{O_2})$ .The cladding surrounds the core and has a lower refractive index to make the optical fiber work. When glass cladding is used, the cladding and the core are manufactured together from the same silicon dioxide-based material in a permanently fused state.

The coating is the true protective layer of the optical fiber. It absorbs the shocks, scrapes, and even moisture that could damage the cladding. An optical fiber is very fragile without the coating. A single microscopic nick in the cladding could cause the optical fiber to break when it’s bent. Coating is essential for all-glass fibers. The coating does not contribute to the light-carrying ability of the optical fiber.

So, the inner part of the fibre optics which carries light is called the core.

Note: The core is the light-transmitting portion of the fiber. The cladding usually is made of the same material as the core, but with a slightly lower index of refraction (usually about 1% lower). This index difference causes total internal reflection to occur at the index boundary along the length of the fiber so that the light is transmitted down the fiber and does not escape through the sidewalls. Core acts as denser medium and cladding as rarer.Thus, light passes through the core after total internal reflection.