What do guns and black boxes mean?

Best answer: The gun frame is a little silvery gray, and the black frame is pure black. Sunglasses, also called sunshades, are used for shading. People usually adjust the luminous flux by adjusting the pupil size in the sun. When the light intensity exceeds the adjustment ability of human eyes, it will cause harm to human eyes. Therefore, in outdoor activities, sunshades should be used to shield the sun, so as to reduce the fatigue caused by eye adjustment or the damage caused by strong light.

The frame of the gun is a little silvery gray, and the black frame is pure black. Sunglasses, also called sunshades, are used for shading. People usually adjust the luminous flux by adjusting the pupil size in the sun. When the light intensity exceeds the adjustment ability of human eyes, it will cause harm to human eyes. Therefore, in outdoor activities, sunshades should be used to shield the sun, so as to reduce the fatigue caused by eye adjustment or the damage caused by strong light.

Role:

Ultraviolet rays can damage cornea and retina, and high-quality sunglasses can completely eliminate ultraviolet rays. When the eye receives too much light, it will naturally shrink its iris. Once the iris shrinks to the limit, people need to squint. If there is still too much light, such as sunlight reflected from snow, it will damage the retina. High-quality sunglasses can filter out up to 97% of the incoming eye rays to avoid injury. Some surfaces, such as water, can reflect a large amount of light, and the bright spots produced in this way will disturb the line of sight or hide objects. High-quality sunglasses can completely eliminate this kind of glare by polarization technology, which we will introduce later.

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