Which optical effect explains how Alhazen improved acuity limits in the 'Book of Optics' circa 1021 AD?

💡 Explanation

When light passes through a small aperture, diffraction effects are reduced because the cone of light is narrower, making pinhole images sharper by diminishing blur. Therefore, Alhazen increased resolution by using light rays that focused through the pinhole effectively decreasing the camera's depth of focus, improving acuity rather than chromatic aberration compensation or refraction analysis.

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