Prisms 　　Prisms are blocks of optical material with flat polished sides arranged at precisely controlled angles to each other. Prisms may be used in an optical system to deflect or deviate a beam of light. They can invert or rotate an image, disperse light into its component wavelengths, and be used to separate states of polarization. Specifications Material:BK7 Glass Dimension Tolerance:+0/-0.2mm Clear Aperture:>80% Angle Tolerance:see table Flatness:λ/2@632.8nm Surface Quality:60-40 scratch and dig Bevel:0.2mm to 0.5mm