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Focus, explained by RP Photonics Encyclopedia; focal point, light rays, imaging, laser beam, related terms
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DMK CO2 Laser Lens ZnSe Focus Laser Mirror Dia. 20mm FL25.4mm 63.5mm for CO2 Laser Engraving Cutting Machine|Lenses| - AliExpress
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Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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