Prisms are blocks of optical material having 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 components wavelength, and be used to separate states of polarization. Prisms will introduce aberrations when used with convergent or divergent beam of light. Using prisms with collimated or nearly collimated light will help minimize aberrations.  Rainbow Research Optics can help you will all your optical  needs.  We are a Colorado custom optics company.  Call us today at 303-371-3000 and visit us online at www.rainbowoptics.com