Which optical phenomenon MOST enabled Alhazen to disprove that the eye actively emits sight rays?

💡 Explanation

When illuminated objects reflect light, specular reflection preserves aspects of the light source. Because light reflection carries directional and attribute information from the source towards the eye because of how clear material affects sight. Therefore reflection exhibiting attribute source, rather than refraction, diffraction, or interference showing other conditions.

• Which risk increases when irrigation channels supplying Aztec chinampas become choked with sediment and algae?
• Which navigational disadvantage existed when using an astrolabe at sea aboard sailing vessels?
• Which phenomenon could limit the accuracy of angular measurements taken with an astrolabe if not corrected for?
• Which challenge did Mesopotamian engineers face creating long irrigation canals near settlements?
• Which structural failure mode most challenged early iron bridge construction given iron's limited elasticity?
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