Which outcome occurred during the medieval era when crafters polished concave lenses?

💡 Explanation

Producing concave lenses led to the first wearable eyeglasses correcting vision through refraction. Because light bends as it passes through the shaped glass, individuals could focus on near objects. Therefore, eyeglasses, rather than telescopes or advanced optics, became possible.

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• Which outcome limited early hand cannon effectiveness relative to improved Chinese crossbows?
• Which risk increases when water supply fluctuations affect the hydraulic system of a Mughal garden's chadar?
• Which outcome results when ancient Roman hypocaust systems directly underlie cultivation plots?
• Which selective pressure occurred as early civilizations cultivated teosinte?