Ibn al Haytham · Science

Light Travels in Straight Lines

With a darkened room and a tiny hole, Ibn al-Haytham proved how light moves - and turned optics into exact geometry.

What you'll be able to recall

You learned that the camera obscura demonstrates light’s straight-line travel. Explain what the upside-down image on the wall proves, in your own words.

Leads to Isaac Newton.

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