Optics

Euclid, a Greek mathematician around 300 BCE, is credited with early formal speculations on light in his work Optics. He presented a law of reflection and discussed how light travels in straight lines, a concept fundamental to geometrical optics. While simple optical instruments were used earlier, ancient Greek philosophers like Pythagoras and Empedocles also contemplated vision and light. Epicurus believed light reflected off objects into the eye, while Euclid's work laid groundwork for understanding light's behavior through mathematical principles. This early work focused on the propagation of light rays, a concept that became crucial for developing practical optics and understanding optical instruments.123