Which constraint limited the accuracy of Ibn al-Haytham's early pinhole cameras (camera obscura) used for solar observation?

💡 Explanation

When forming images with early camera obscura, the pinhole aperture size governed image sharpness; a larger pinhole allows more light, but increases blur because of multiple light rays from each object point. Therefore aperture size limited image accuracy, rather than glass purity, calibrated sources, or atmospheric density which affect brightness & contrast, not focus.

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