Paul prism is a type of reflection prism which can be used to alter the orientation of an image. Light enters the large face of the prism, then hits on the roof, by total internal reflection twice from the roof, the beam exits again through the large face. An image traveling through a Paul prism is rotated by 180° but not inverted.
| SPECIFICATION | |
| Material | BK7 grade A optical glass, SF11 glass etc. |
| Dimension Tolerance | +0.0/-0.2 mm |
| Clear Aperture | >85% |
| Deviation | Up to 180°±5 arc seconds |
| Surface Quality | 60-40 scratch and dig |
| Wavefront Distortion | λ/4@632.8nm |
| Flatness | λ/2@632.8nm |
| Protective Bevel | 0.25 mm x45° |
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