Whats Polarized glasses and Where it is use ?
Why are Polarized glasses used for? Polarized glasses are mainly used for reducing the glare. Principle: A light wave is known to vibrate in multitude of directions. In general a light wave can be thought of as vibrating in horizontal and vertical planes. Vertical component of light helps human eye to see where as horizontal component creates glare. Light reflecting off a horizontal shiny surface such as car windscreen , sand, water, snow, and asphalt roads. Glare reduces visibility, makes vision uncomfortable and painful. Polarised sunglasses are used to reduce glare. Sunglasses contain polarizing filters oriented vertically to the frames so that they block horizontally polarised light. How are Polarised glasses made? Poly vinyl alcohol is heated and stretched to five times its natural length, making it even thinner. This lengthens PVA’s long chain molecules, causing them to align. The stretched PVA is then dipped in iodine solution. The iodin...