What happens if spherical lenses are not invented?
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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.
A spherical lens doesn't actually bring parallel rays to a common focus (see figure 1). Rather, the "focus" of the lens depends on the distance from the distance from the center of the lens, with light passing through the edges of the lens coming to a focus closer to the lens than light passing through the center. This produces the phenomenon of "focus shift", which is well known to photographers: If
A spherical lens doesn't actually bring parallel rays to a common focus (see figure 1). Rather, the "focus" of the lens depends on the distance from the distance from the center of the lens, with light passing through the edges of the lens coming to a focus closer to the lens than light passing through the center. This produces the phenomenon of "focus shift", which is well known to photographers: If
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