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The triple prism is a form of optical prism that presents a geometric triangle in appearance and is the most common in optical prisms and is well known in the art, but is not the most commonly used prism. Triangular prisms are most commonly used for the dispersion of light, which breaks down light into different spectral components. The use of different wavelengths of light, due to the different refractive indices, deflects different angles during refraction, causing dispersion. This effect is also used to measure the refractive index of the prism material with high precision.
| Range of diameter | Dia.0.5mm-Dia.200mm |
| Range of curve radius | R1.5-R∞ etc. |
| Tolerance of diameter | +/-0.1, +/-0.01, +/-0.005 etc. |
| Surface accuracy | λ , 1/2λ , 1/4λ , 1/10λ etc. |
| Tolerance of Thickness | +/-0.1, +/-0.05, +/-0.01 etc. |
| Centration | +/-2′,+/-1′ etc. |
| Aperture N | 5, 1 etc. |
| Irregularity ΔN | 2, 1, 0.5, 0.2 etc. |
| Surface quality | 60/40, 40/20, 20/10, 10/5 etc. |
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