Which optical outcome results when a polished convex lens, crafted using medieval grinding techniques, exhibits significant spherical aberration?

💡 Explanation

When medieval lenses exhibit significant spherical aberration, rays passing through lens edges inadequately converge because the spherical surface deviates from optimum aspheric shape, resulting in blurred image formation away from the center. Therefore, a blurred center results, rather than fringing, shifts, or reduced transmission, since these need wavelength dependent refraction, anisotropic light or different scattering phenomena.

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