ray diagram

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Diagram that explains how and where mirrors and lenses form images. The paths of light rays are represented by lines, and standard constructions are used for certain rays that have known paths through a mirror or lens system. For example, a ray that arrives parallel to the principal axis of a converging lens will pass through its principal focus on the far side of the lens; a ray passing through the centre of a lens is not deviated. If the paths of two rays from a single point on an object are plotted through a lens or mirror system, an image of that point will be formed where the paths of those two rays cross.

The three stars are taken from the arms of the Duchy of Selje. The flag uses the pan-Slav colours. Effective date: 25 June 1991. >>