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Why do sunglasses look colorful?
Release time:
2023-08-21
Sunglasses, is a kind of vision care products for preventing the sun's strong stimulation caused by the human eye damage. The surface hardness of the commonly used lens material is low, easy to scratch, and need to do a reinforcement, but the surface of the reinforced lens often appears rainbow pattern, especially in the strong light performance is more obvious, the reason is that the thin film interference occurs.
Optical principle
Assuming that a beam of light is irradiated into a thin film, due to the different refractive indices, the light wave will be reflected by the upper and lower interfaces of the thin film, and a new light wave will be formed due to mutual interference, which is a phenomenon known as thin-film interference.
Sunglasses coated with hardening liquid (strengthening liquid), white light (sunlight, light) incident on the upper and lower surfaces of the film are reflected, the reflection of the upper and lower surfaces of the film, to meet the conditions of light interference (the same frequency, the phase difference is constant, the same direction of vibration), the occurrence of thin-film interference.
Thin film interference results in the formation of colored light and dark stripes, of course, control the film thickness will appear phase cancellation interference phenomenon, but this needs to be done according to the refractive index of the film system design, conditions and environmental requirements are high, the conventional reinforcement of the line is very difficult to appear phase cancellation, resulting in a rainbow pattern of the concept is very large.
The colorful stripes are like on the retina, the visual cells convert the light information into electrical information, through the optic nerve to the brain, you will feel the colorful light.
Winlight low-color, zero-color reinforcing liquid (hardening liquid) refractive index and the substrate to match, wear-resistant, high operability, can avoid the appearance of reinforced color, to bring better visual enjoyment for customers.
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