Solving a problem in physics section 66 point 93 optics

93. The angle of rotation of the plane of polarization of yellow sodium light when passing through a tube with a sugar solution is equal to φ = 40 °. The length of the tube is d = 15 cm. The specific rotation of sugar is [α] = 1.17 ∙ 10−2 rad ∙ m3 / (m ∙ kg). Determine the density ρ of the solution.