equiconvex lens

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Lens (optics) — For other uses, see Lens. A lens. Lenses can be used to focus light. A lens is an optical device with perfect or approximate axial symmetry which tra … Wikipedia
Achromatic telescope — The achromatic telescope is a refracting telescope that uses an achromatic lens to correct for chromatic aberration. How it worksWhen an image passes through a lens, the light is diffracted at different angles for different wavelengths. This… … Wikipedia

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