A roof prism is an optical element designed to restore correct image orientation—ensuring the final image appears upright and unreversed. Its defining feature is an internal “roof surface,” formed by two mutually perpendicular reflective faces. Light undergoes two successive reflections at this roof surface, achieving a 90° beam deviation while simultaneously canceling lateral (mirror) inversion—thus preserving natural image handedness and direction.
Specifications
| Parameter | Description |
| Material | Optical glass (e.g., K9), fused silica, etc. |
| Dimensions | 10×10×10mm~50×50×50mm |
| Surface Coating | Input/output faces: Anti-reflection (AR) coating |
| Roof surface: High-reflectivity coating (aluminum or silver) | |
| Optical Function | 90° beam deviation with erect-image output |
| Operating Wavelength Range | 400–700 nm (visible spectrum) |
Optical Path Diagram:
Typical Applications:
• Binoculars
• SLR camera viewfinders
• Military optical sights
