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Light

Light is electromagnetic radiation visible to the human eye, occupying wavelengths between approximately 380 and 700 nanometers in the electromagnetic spectrum. It represents a fundamental phenomenon in physics and plays a central role in understanding the universe, from the behavior of atoms to the structure of galaxies. Light travels at a constant speed of approximately 299,792 kilometers per second in a vacuum, a value denoted as c in physics equations.

Wave-Particle Duality

Light exhibits wave-particle duality, behaving simultaneously as both a wave and a particle depending on the experimental context. When light interacts with matter through absorption or emission, it displays particle-like properties and is described in terms of photons—discrete units of energy. Conversely, when light propagates through space or passes through apertures and slits, it demonstrates wave-like properties including interference, diffraction, and polarization. This dual nature challenged classical physics understanding and became central to the development of quantum mechanics.

Interaction with Matter

Light interacts with matter through various mechanisms including reflection, refraction, absorption, and scattering. When light encounters a medium with a different refractive index, its speed and direction change according to Snell’s law. The interaction of light with electrons in atoms and molecules provides the basis for spectroscopy, allowing scientists to determine the composition and properties of materials. These interactions form the foundation for technologies ranging from lenses and optical fibers to solar cells and lasers.

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