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VOLUME 44 (1986) | ISSUE 7 | PAGE 308
Bright spot behind the shadow of an illuminated object (or an intensity dip) moving along the surface of a nonlinear medium
A new type of nonlinear refraction is studied: The formation of a bright spot behind the edge of a shadow of an illuminated object (a disk, a sphere, a half-plane, or a strip) which moves in the ray or which changes the shape of the ray in front of a layer of a nonlinear medium. The edge intensification of the brightness is measured and several photographs are shown. The observed effects are explained.