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â¢ CONCAVE LENS (noun) The noun CONCAVE LENS has 1 sense: 1. a lens such that a parallel beam of light passing through it is caused to diverge or spread out. Familiarity information: CONCAVE LENS used as a noun is very rare.
For a thin double convex lens, refraction acts to focus all parallel rays to a point referred to as the principal focal point. The distance from the lens to that point is the principal focal length f of the lens.For a double concave lens where the rays are diverged, the principal focal length is the distance at which the back-projected rays would come together and it is given a negative sign.he principal focal length of a lens is determined by the index of refraction of the glass, the radii of curvature of the surfaces, and the medium in which the lens resides. It can be calculated from the lens-maker's formula for thin lenses.