Interference filters are optical devices that selectively transmit certain wavelengths of light while reflecting others. They work based on the principle of constructive and destructive interference, where light waves combine to enhance or diminish specific colors. These filters are commonly used in photography, scientific instruments, and lighting applications to achieve desired color effects. These filters are made of multiple thin layers of materials, often including glass and dielectric coatings. By adjusting the thickness and composition of these layers, manufacturers can design filters that target specific wavelengths, making them useful in various fields such as spectroscopy and optical communications.