Which optical consequence arises when grinding medieval glass lens with uneven pressure distribution?

💡 Explanation

When medieval lenses were ground unevenly, localized pressure variations resulted in deviations from the desired spherical shape because the material removal rate was pressure-dependent, causing spherical aberration. Therefore, image distortion results, rather than chromatic effects, ring artifacts or polarization, which involve color dispersion, regular obstruction patterns, or lightwave alignment respectively.

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