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Which optical aberration increases when medieval astrolabes use small pinholes?

A)Chromatic blurring intensifies noticeably
B)Spherical distortion remains unchanged
C)Diffraction artifacts worsen substantially
D)Image brightness increases unusually

💡 Explanation

Increased obstruction intensifies the effect of diffraction, because the aperture size is nearly the same size scale as the wavelength of light; therefore, diffraction artifacts worsen, rather than refraction or brightness increases which need different circumstances.

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