While grinding lenses was difficult and costly, which key optical property was critically constrained when shaping early magnifying glasses?

💡 Explanation

Medieval lensmakers struggled with chromatic aberration because inconsistent glass composition and imprecise manual grinding led to the refractive index varying by wavelength; therefore, image quality suffered rather than the RI diminishing or material becoming unstable, given the process limits.

• Which consequence occurs when historical rope bridges lack sufficient redundancy?
• Which effect arises when an astrolabe's altitude scale is warped due to uneven thermal expansion across its surface?
• Which outcome occurs when the Antikythera mechanism's gear train experiences excessive friction?
• Which astronomical calculation was significantly simplified using the 'universal plate' on an astrolabe?
• Which destructive outcome accelerates deterioration of pietra dura inlay when thermal cycling affects a sandstone structure?
• Which outcome resulted from ice accumulation on the bridge cables due to freezing rain on the Quebec Bridge's under-construction cantilever spans?