Double Concave Lens

• Biconcave Lens: Thin-center optical element with both inwardly curved surfaces, functioning as a diverging lens. Causes parallel light rays to diverge outward via refraction, producing virtual images; features a negative focal length. Used to spread light beams, correct aberrations (e.g., chromatic, spherical), or adjust optical paths in systems such as laser beam expanders, telescopes, and imaging devices.
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