Optical Components Fused Silica Wedge Prism PARAMETER: The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism. Specification Material BK7 glass / Fused silica Surface Flatness: < λ / 10 @ 633nm ~λ/4@633nm Surface Quality: 60/40, 40/20, 20/10, 10/5 (both sides) Dimension Tolerance: