Question

What is a spherical lenses?
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Answer 1

Answer:

A "spherical lence" is a lens whose surface has the shape of sphere

Answer 2

Answer:

A "spherical lens" is a lens whose surface has the shape of (part of) the surface of a sphere. On this page, we will determine some values for the focal length of a spherical lens. Figure 1 -- Spherical Aberration. A spherical lens doesn't actually bring parallel rays to a common focus