Problem 5.193

Plane-polarized light of wavelength \(589 \mathrm{nm}\) propagates along the axis of a cylindrical glass vessel filled with slightly turbid sugar solution of concentration \(500 \mathrm{~g} / \mathrm{l}\). Viewing from the side, one can see a system of helical fringes, with \(50 \mathrm{~cm}\) between neighbouring dark fringes along the axis. Explain the emergence of the fringes and determine the specific rotation constant of the solution.