A ray of light in air makes an angle of incidence 450 at the surface of a sheet of ice. The ray is refracted within the ice at an angle of 300, if refractive index of ice is 1.309 while that of air is 1.0, what is the critical angle for the ice?
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DNA is essentially an extremely long double-stranded rope in which the two strands are wound about one another. As a result, topological properties of the genetic material, including DNA underwinding and overwinding, knotting, and tangling, profoundly influence virtually every major nucleic acid process.
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