Solving a problem in physics section 35 point 20 optics

20. In the system consisting of the polarizer and analyzer, which angle α between the main planes is 60 °, falls natural light, the intensity of which is attenuated after passing through the system at n = 10. Neglecting losses in the reflection of light, determine what percentage of the intensity of incident light is lost during the passage of the system (loss of the polarizer and analyzer are identical).