Which optical effect enabled Ibn al-Haytham to more accurately trace light paths impacting curved surfaces?

💡 Explanation

When simulating illumination on curved surfaces, oblique-angle scattering occurs because the reflection off non-ideal realistic materials causes energy to distribute differently as incident angle changes. Therefore oblique-angle modelling results in improved tracing, rather than specular reflection improvements, needing accurate surface normals and Fresnel equations. It is not astigmatism, requiring wavefront manipulation. It is also not increased aberration, caused by lens imperfections.

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