Which optical phenomenon explains why the medieval Islamic scientist Ibn Sahl's lens designs minimized spherical aberration?

💡 Explanation

When light enters a lens, Snell's Law dictates refraction based on refractive indices and incident angle, and Ibn Sahl used Snell's Law to determine lens shapes that focus all rays to a single point. Therefore minimized spherical aberration occurs, rather than diffraction, internal reflection or dispersion which represent alternative optical behaviours.

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