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To correct such aberrations, it is often necessary to combine in one mount several lens elements (single lenses), some of which may be convex and some concave, some made of dense high-refractive or high-dispersive glass, and others made of low-refractive or low-dispersive glass
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https://www.britannica.com/technology/lens-optics
To correct such aberrations, it is often necessary to combine in one mount several lens elements (single lenses), some of which may be convex and some concave, some made of dense high-refractive or high-dispersive glass, and others made of low-refractive or low-dispersive glass
https://www.britannica.com/technology/machine
A lever pivots on a fulcrum, allowing a force applied at one point to create a greater force at another point