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What part of the scientific method did al-hasa discover?

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Answer:

al-Haytham devised the world's first camera obscura, observed what happened when light rays intersected at its aperture, and recorded the results.

Step-by-step explanation:

User GBleaney
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To test his hypothesis that "lights and colors do not blend in the air," for example, Ibn al-Haytham devised the world's first camera obscura, observed what happened when light rays intersected at its aperture, and recorded the results.
User Alysonsm
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