Question

Think about the way optical fibers are designed. why are the ends of the fibers glowing very brightly while the sides of the fibers are not?
A. because the light only strikes the ends of the fibers, not the sides
B. because the fibers’ sides absorb any light that strikes it
C. because the ends of the fibers convert the signal into visible light
D. because the light is reflected back into the fiber along its sides
PLEASE HELP ITS MY LAST QUESTION!!

Answer 1

Answer:

D. because the light is reflected back into the fiber along its sides

Explanation:

The fiber is constructed in a way that the light is bent/reflected/refracted toward the center core of glass. So, from the center core, there is a layer above it that has a different propagation than the core, and above that the same thing. To give you a real world visual example, if you look down in a pool of water, then stick a straight stick into it, you see that the straight stick appears to bend. That is what is happening to the light as it travels through a different medium (air to water). This same effect is incorporated in the fiber optic cable construction.