Lense

When a lense is described as of 4 inch focus, it means that such a lens is capable of bringing parallel rays to a point at a distance of 4 inches from the lens.

Basically, a beam of light passing through a lens parallel to the optical axis converges to form a focused image on the film. Spherical aberration is the term for an optical fault caused by the spherical form of a lense that produces different […]