The correct answer is: True.
Optical fibers suffer radiation losses at bends or curves on their paths. This is because the light waves traveling through the fiber are constantly being reflected off of the inner and outer surfaces of the fiber. When the fiber bends, the light waves are no longer traveling in a straight line, and some of the light is lost as it is reflected off of the curved surface. This loss of light is known as radiation loss.
The amount of radiation loss that occurs depends on the radius of the bend and the wavelength of the light. For small bends, the radiation loss is relatively small. However, for large bends, the radiation loss can be significant. This is why optical fibers are typically designed to be as straight as possible.
There are a number of ways to reduce radiation loss in optical fibers. One way is to use a fiber with a smaller core diameter. This will reduce the amount of light that is lost as it is reflected off of the curved surface. Another way to reduce radiation loss is to use a fiber with a higher refractive index. This will cause the light waves to travel closer to the center of the fiber, where they will be less likely to be lost as they are reflected off of the curved surface.
Radiation loss is a significant factor in the design of optical fibers. It is important to consider the amount of radiation loss that will occur when designing an optical fiber system.