Solving a problem in physics section 35 point 21 optics

21. Partially polarized light passes through Nicole. When you turn on the corner of Nicolas φ = π / 3 from the position corresponding to the maximum light transmission, the transmitted beam intensity decreased n = 2 times. Ignoring the absorption of light in Nicole define: 1) the ratio of the intensities of plane-polarized and natural light; 2) the degree of polarization of the incident light.