light

• Light is a form of electromagnetic radiation visible to the human eye, traveling through space in the form of waves
• Dutch physicist Christiaan Huygens proposed the wave theory in 1690, stating that Light is a Wave
• English Physicist Isaac Newton theorized that light is made up of tiny particles in 1704
• The wave theory of light won over the particle theory, explaining modern experiments by Thomas Young (1801) and Augustin Jean-Fresnel (1806)
• James Maxwell proved light is a transverse wave partly magnetic and electrical, while Max Planck theorized light was emitted in packets of energy called quanta
• German-American physicist Albert Einstein called each quantum of energy a photon
• Light travels in a straight path, casting a shadow when encountering an obstacle that doesn't allow it to pass through
• Rectilinear propagation of light is how light travels in a straight line through a homogenous and transparent medium, best observed in lasers and flashlights
• Light's colors depend on its wavelength and frequency, with higher frequency light being more intense and holding greater energy
• The speed of light is 299,792,458 m/s, determined using cesium clocks and used to define the length of a meter
• UV light is more deadly to cells compared to red visible light due to its higher frequency and shorter wavelength