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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.
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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.

Explanation:

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