Generally, it refers to the polarizer made by coating dichroic substances on transparent sheets. Compared with polarizing prisms, it allows a large incident angle and is economical, and can be processed into a polarizer with a larger effective diameter. Using two polarizing plates, many polarizing experiments can be carried out. Two polarizing plates are put into the light source, and the polarizing direction of each polarizing plate is changed, so that a large range of dynamic light quantity adjustment can be carried out. The product is thin and light, and can be installed in narrow gaps in optical systems. Because it is a plastic sheet, it will not be damaged even if it falls. However, the damage threshold of thin film polarizer is small, and P-polarized light and S-polarized light cannot be separated.
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