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       Polarized sunglasses are a type of sunglasses. Polarized light can be divided into three types, namely linear polarized light, elliptical polarized light and circular polarized light. Generally the so-called polarized light refers to linear polarized light, also known as plane polarized light. The vibration of this light wave is fixed along a specific direction, the propagation path in space is sinusoidal, and the projection on the plane perpendicular to the propagation direction is a straight line.         In daily life, there are too many light sources that can produce harmful light, especially sunlight; the...