Задача id13755

The phenomenon of self-focusing is explained by the dependence of the refractive index on the light intensity (n = n0 + n2E02, where E0 is the amplitude of the electric field strength in the light wave). Carbon disulfide has one of the largest values of n2 (n2 = 2 • 10-11 SGSE units). A powerful beam of laser radiation with a parabolic dependence of intensity on the distance to the center of the beam (I = I0(1 – r2/r02) at r r0, I = 0 at r > r0) passes through a layer of carbon disulfide with a thickness of L = 5 cm. Find at which distance

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