These lenses split light with a left-handed circular polarization (LCP) into two focused light beams with left and right-handed circular polarization (RCP). Credit Fan Fan, Hunan University ...

Once through the lens, the ray should pass through the principal focus. Draw a ray which passes from the object through the centre of the lens. Some ray diagrams may also show a third ray.

Convex and concave lenses can both be used to correct defects of vision. The most commonly occurring defects of vision are ‘short sightedness’ and ‘long sightedness’. People who are ...