Which blurring results when Medieval astrolabes used imperfect lenses?

💡 Explanation

Spherical aberration arises because edges of a lens focus light differently; therefore a focused planar image blurs. This is inherent to lens shape rather than color dispersion (chromatic), Airy disks (diffraction), or off-axis asymmetry (coma).

• Which effect complicated the geocentric model's ability to accurately predict planetary positions before telescopes?
• Which error increases when an 18th-century navigator fails to account for dip when using a sextant?
• Which mechanism caused damage accumulation in Roman siege towers under repeated ballista impacts?
• Which effect consistently limited the agricultural productivity of Inca terraced farming at high altitudes?
• During a Roman siege, which consequence develops when miners undermine defenses?
• Which consequence resulted from concentrated fire at a specific point during a Medieval siege?