Which optical effect enabled Alhazen to accurately describe image formation in a pinhole camera obscura?

💡 Explanation

When light passes through a small hole, rectilinear propagation occurs because light rays travel in straight lines. Therefore an inverted and reversed image forms on the opposite wall, rather than diffraction, polarization or aberration which involve different mechanisms.

• Which structural failure was most commonly experienced in Roman concrete fortifications built near the sea?
• Which structural weakness becomes apparent when Roman roads on clay subsoil experience prolonged freezing temperatures?
• Which mechanical action describes the primary contribution of torsion springs in a Roman ballista?
• Which risk increases when supporting walls fail during pre-Columbian terracing?
• Which outcome occurred when bronze-age metallurgists smelted arsenical copper ore without proper ventilation?
• Which risk increases when a Roman road's drainage system experiences sustained blockages?