Refraction is the bending of electromagnetic radiation, such as light or heat, as it passes obliquely from one medium into another of different density.
Refraction is the bending of electromagnetic radiation, such as light, as it passes at an angle from one medium into another of different optical density. Because the radiation travels at different speeds in different materials, it changes direction at the boundary between them when it strikes at an oblique angle. This bending is the principle behind lenses and is fundamental to how light is controlled in optical systems.
In lighting and optics, refraction allows lenses to focus and spread light, shaping a fixture's beam by bending the rays as they pass through the glass. The same principle governs how light travels through optical fiber, where the relationship between the refractive properties of the core and cladding keeps light contained within the fiber.
In commercial and industrial communication and lighting, refraction underlies both optical fiber transmission and the lenses used in fixtures. Understanding the principle supports an appreciation of how light is guided and shaped in these systems.
Because the same principle that lets lenses focus light also governs how light travels through optical fiber, refraction underlies both the lenses used in fixtures and the core-and-cladding relationship that keeps light contained within a fiber across a communication link.
At Windy City Wire, the focus on fiber optic and low-voltage cable connects to the optical principles, including refraction, that govern how light travels through fiber. Understanding refraction helps illustrate why fiber construction guides light reliably along a communication link.