How to verify that circularly polarized light is true?

A: Each Woowhead Guanfudun comes with a dedicated circularly polarized light detection card. Verification method: After applying the film, light up the screen to display a white image. Place the detection card in front of the screen and rotate it slowly for observation. True circular polarized light: During rotation, the picture remains uniform and soft, with no obvious changes in light and shade. Ordinary linear polarized light: When rotated to a specific Angle, changes in light and shade may occur, accompanied by uneven brightness or local color anomalies. Thus, the invisible optical technology is transformed into a fact that can be verified by hand. The observation differences between the two technologies: scinique® 1.0 Dual protection Synergistic optical technology (internal protection: circularly polarized light · self-adjusted soft light standard; external protection: magnetron sputtering AR· anti-glare coating) ensures uniform and soft rotating observation images. scinique® 2.0 Dual-protection Synergistic optical technology (internal protection: circularly polarized light · narrowband phase matching calibration; external protection: magnetron sputtering AR· anti-glare coating) presents an orange-yellow soft light effect at specific angles on circularly polarized screens (such as apples), providing a more gentle viewing experience. Note: During the detection, the screen should display a white image and the brightness should be adjusted to medium or above. The test card is a polarizer. When not in use, put it back in the package for storage to avoid scratches.