For example, there are two polarizers, one is used as a polarizer and the other is used as an analyzer. When the angle between their polarization directions is 30°C, a beam of monochromatic natural light passes through them, and the exit light intensity is I1: When the angle between their polarization directions is 60°C, another beam of monochromatic natural light passes through them. Through them, the emitted light intensity is I2,, and I1=I2 Find the ratio of the intensity of monochromatic natural light between the two parents.