Today, from young children to teenagers to adults, almost everyone around us has a barrier between their eyes and the vivid and vast world around them – concave lenses. Glasses and contact ...

Products include windows, Plano-Convex/concave lenses, spherical lenses, prisms, rods & tips, wave-guides, filters and much more, all custom made to your drawings and design.

Draw a ray which passes from the object through the centre of the lens. Some ray diagrams may also show a third ray. Peep holes contain concave lenses. They are set into doors so the occupant can ...