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| plano-concave lens |
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| Plano-concave glass lenses are manufactured with one concave surface and one plane surface. These lenses have negative focal lengths |
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| Bi-convex |
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| Double-Convex Lenses are lenses which have two outward curved surfaces. Double-Convex Lenses have a positive focal length and will act as a magnifying or condensing lens. |
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| Bi-concave |
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| These lenses have negative focal lengths. These lenses diverge collimated incident light and form virtual images, which are seen through the lens. They are often used to expand light or increase focal lengths in existing systems. |
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