Certified Fiber Optics Practice Exam

The phenomenon of light bending when passing between two media is called what?

1. Reflection

2. Diffraction

3. Refraction

4. Dispersion

The correct answer is: Refraction

The phenomenon of light bending when moving between two different media is known as refraction. Refraction occurs due to a change in the speed of light as it enters a medium with a different optical density. For example, when light travels from air into water, it slows down and changes direction, resulting in the bending effect that is observable in everyday life. The degree to which light is bent depends on the indices of refraction of the two media involved. In fiber optics, refraction is a critical principle that allows light to be transmitted through the fiber. It helps in maintaining the light within the core of the fiber despite bends and turns, ensuring efficient transmission of signals. This principle is crucial for the design and functioning of optical fibers, making understanding refraction fundamental for anyone studying fiber optics.