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How does a meniscus lens differ from a biconvex or biconcave lens?
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Explanation of the refraction of light through different lenses.
In optics, lenses are classified based on the curvature of their two surfaces. While biconvex and biconcave lenses have two surfaces that curve in the same general direction (outward or inward, respectively), a meniscus lens is characterized by having one convex surface and one concave surface.1
The primary differences are as follows:
- Biconvex lens: Both surfaces are convex (bulging outward), causing the lens to be thicker at the center than at the edges.
- Biconcave lens: Both surfaces are concave (depressed), making the lens thinner at the center than at the edges.
- Meniscus lens: This lens features one convex surface and one concave surface, resulting in a crescent-shaped cross-section.21
Depending on the specific curvature of these surfaces, a meniscus lens can be either converging (thicker in the middle) or diverging (thinner in the middle). These distinctions are fundamental to how a lens refracts light to form real or virtual images.1