Rochester used to be the gathering place of American optical enterprises, but now it is not as good as before. The University of Rochester has a strong major in optics. Optics is an important branch of physics. It is also a discipline related to optical engineering technology. In a narrow sense, optics is a science about light and vision. In the early days, the word optics was only used for things related to eyes and vision. Today, optics is a science that studies the generation, propagation, reception and display of electromagnetic radiation and the interaction with matter in a wide range from microwave, infrared, visible light and ultraviolet to X-ray and γ-ray, focusing on the range from infrared to ultraviolet. It is an important part of physics. Light is an electromagnetic wave. In physics, electromagnetic waves are described by Maxwell equations in electrodynamics; At the same time, light has wave-particle duality, and the particle nature of light needs to be described by quantum mechanics. The nature of light is also an important topic in optical research. Particle theory regards light as composed of particles, and thinks that these particles fly in a straight line according to mechanical laws, so light has the property of straight line propagation. /kloc-Before the 0/9th century, particle theory was popular. However, with the deepening of optical research, people have found many phenomena that cannot be explained by straightness, such as interference and diffraction, which can be easily explained by the fluctuation of light. So the light wave theory has gained the upper hand again. The debate between the two theories constitutes a red line in the history of optical development. Optics in a narrow sense is a science about light and vision. In the early days, the word optics was only used for things related to eyes and vision. Today, optics is in a broad sense. It studies the generation, propagation, reception and display of electromagnetic radiation and its interaction with matter in a wide wavelength range from microwave, infrared, visible light, ultraviolet to X-ray. Optics is an important part of physics and a subject closely related to other applied technologies.