Some types of optical prism are not in fact in the shape of geometric prisms. It consists of sodalite cages which are connected through hexagonal prisms. It separates the wavelengths using passive optical components such as bandpass filters and prisms. Individual crystals are rare, but occur as slender to acicular prisms. Inside, he finds long loops of chain fitted with miniature prisms, mirrors, and lenses. This produces anisotropic particles with nonspherical shapes including prisms, cubes, and rods. Recently, an alternative to prisms and gratings has been developed&colon; chirped mirrors. It is composed of a sequence of prisms, or gratings. The polarimeter is made up of two Nicol prisms (the polarizer and analyzer). A set of more complex wooden blocks that includes cubes, planks, and triangular prisms. Brewster angle prisms are used in laser physics. The dispersion of light by glass prisms is used to construct spectrometers and spectroradiometers. He finds the volume of rectangular prisms, pyramids, and the frustum of a square pyramid. The ChromaDepth eyeglasses contain special view foils, which consist of microscopically small prisms. This is most commonly achieved through the use of fresnel prisms.