Which property describes how Alhacen's 'camera obscura' demonstrated rectilinear light propagation?

💡 Explanation

When a camera obscura is used, image clarity relies on having a small pinhole, as this produces straighter light lines each mapping a point in the scene to a nearly corresponding point in the camera image, demonstrating that light travels in rectilinear paths. Therefore option A results, rather than dispersion, intensity decrease, or diffraction, which depend on separate optical properties.

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