Question

What is the source of opacity in the sunglasses? And why?

Answer 1

Sun glasses use polarized lenses that increases its opacity. Polarized lenses are coated with a special chemical film that helps reduce glare. Glare is caused when light from the sun is reflected off of water or a solid surface. It works on the principle of polarization. It allows only specific polarized light to pass through (i.e; eithe vertical or horizontal). Therefore fishermen use sunglasses in order to see effectivley into the water, because most of the light that causes glare are blocked. Also its used by drivers to reduce the glare of light reflacting off susrfaces.