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← HistoryWhich mechanism underlies the focusing of light within Alhazen's camera obscura creating an inverted image?
A)Refraction through a curved lens
B)Reflection from a parabolic mirror
C)Diffraction through a narrow slit
D)Rectilinear propagation through a pinhole✓
💡 Explanation
When light passes through a small pinhole, rectilinear propagation occurs because light travels in straight lines, projecting an inverted image on the opposite surface. Therefore, a pinhole creates projected image, rather than refraction or reflection, requiring lenses or mirrors, or diffraction requiring wave interference.
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