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Light in physics can be defined as electromagnetic wave, people can see the light is called visible light, it is only a very narrow range of electromagnetic frequency range, wavelength range is about 380 ~ 760nm, according to red, orange, yellow, green, blue, indigo, purple gradual change, different wavelength range of light color and different, we see white light is composed of a variety of color light composite. 
The reason why we can distinguish colors is largely dependent on the color composition contained in the light. When the light of the human eye, the eye will produce "vision", and then the brain will reflect these visual stimulus signals, and tell you the "color" is "red" or green, most people (color blind or weak color will have a difference in perception) produce "red" stimulus light wavelength is about 620 ~ 760nm range, And produce the "green" feeling of light wavelength is about 520 ~ 560nm.
Liyang Paper products co., ltd is a factory and trade company located in Dongguan, China. Specialized in producing gift paper packaging and printing, such as gift box, gift bags, book printing, notebooks, folders, wine box,jewelry box, cosmetic box, watch box, shoe box,etc. Custom made base on your design is welcome, feel free to contact Liyang printing with your full detail.
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Ms. Lily Yu
Tel:86-769-82795922
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Telefoonka gacanta:+86 13580852389
Email:admin@lyprinting.com
Cinwaanka:Jiumenzhai Jiuzui New District Road, Humen Town, Dongguan City, Guangdong Province, 523999, China., Dongguan, Guangdong
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