interference filter

An interference filter is an optical device that selectively allows certain wavelengths of light to pass through while blocking others. It achieves this by using thin layers of materials that reflect and transmit light based on its wavelength. When light hits these layers, some wavelengths interfere constructively (enhancing their intensity), while others interfere destructively (dimming their intensity). This principle is widely used in cameras, scientific instruments, and telecommunications to isolate specific colors or frequencies of light, enhancing clarity and accuracy in various applications.