Precision crafted of clear acrylic. It is available on a blister card and is 4.4cm in length. For thousands of years man has been fascinated by prismatic effects. Now you can hold the power to this wonderful mystery in your hands.. The Right Angle Prism unleashes a rainbow of colours from pure white light. Imagine performing the same experiment as Sir Isaac Newton did over 300 years ago while he was making his first prism discoveries. discover for yourself the wonderful secrets of prismatic effects...even make a periscope with the colourful instructions included.