• Illustration by Edmond H Thall, MD.
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    Refractive Mgmt/Intervention

    Behavior of light crossing an aperture. A, According to the corpuscular theory of light, a collimated beam should remain so after crossing an aperture that blocks the sides of the beam. B, Instead, the beam diverges. This phenomenon, called diffraction, violates the law of rectilinear propagation and suggests that light is a wave, not a series of particles (corpuscular).