Convex lenses are constructed from transparent material and attached to two different surfaces. One of these surfaces must be curved. When these spherical surfaces bulge outwards, it is called a convex or bi-convex lenses. A piece of glass

Everyone knows that eyeglasses allow people to see clearly. However, few really understand how glasses actually work. Vision occurs when light enters the eye and lands on the retina, a light-sensitive membrane located at the back of the eye