Optical parts are components used to collect, focus, transmit and control light. They are usually made of transparent materials, such as glass or plastic, with special optical properties. The following are the most common components of optical parts.

1. Lens: The lens is one of the most basic components in the optical system. They are curved surfaces made of refractive material that can focus or disperse light. Lenses are divided into convex and concave lenses, which are used to focus and disperse light, respectively.

2. Mirror: The mirror is another important component in the optical system. They are usually made by coating the back of the glass with a metal reflective layer, which can reflect light. Mirrors are divided into flat mirrors and curved mirrors, which are used to reflect light and focus light respectively.

3. Optical fiber: Optical fiber is a thin transparent material that can transmit light inside. They are usually made of high-purity glass or plastic and are used for long-distance optical signal transmission. Optical fiber is widely used in communication, medical and sensor fields.

4. Filter: A filter is a special optical component that can selectively transmit or reflect light of specific wavelengths. They are usually made of dyed glass or multilayer films and are used to adjust the color, brightness and wavelength of light.

5. Beam splitter: A beam splitter is an optical part that can divide incident light into several different directions. They are usually made of optical glass or multilayer films and are used to divide light, for example in interferometers, optical microscopes and lasers.

6. Polarizer: A polarizer is an optical component that can selectively pass or block light in a specific direction. They are usually made of polarizing materials and are used to control the polarization state of light, such as in liquid crystal displays and polarizers.

In addition to the above-mentioned optical parts, there are many other parts constituting the optical system, such as a diaphragm, a grating, an optical prism, and various holders and adjusting devices. The combination and configuration of these optical components can achieve a variety of optical functions to meet different application requirements.