Question

which synthetic fibre is used to make power glasses

Answer 1

Micro fiber or micro fibre is synthetic fiber finer than one denier or dec itex/thread.[1]This is smaller than the diameter of a strand of silk (which is approximately one denier), which is itself about 1/5 the diameter of a human hair. The most common types of micro fibers are made from polyesters, polyamides  or a conjugation of polyester, polyamide, and polypropylene.[2] Micro fiber is used to make mats, knits, and weaves for apparel, upholstery, industrial filtres, and cleaning products. The shape, size, and combinations of synthetic fibres are selected for specific characteristics, including softness, toughness, absorption, water repellency, electrostatics, and filtering capabilities.