Question

Where do we see concave lens convex lens in bifocal lens lenses?

Answer 1

In bifocal lens ,the upper part of lens consist concave (to correct myopia) and lower convex (to correct  hypermetropia). concave is used in upper portion of distant vision and convex in lower vision.

Answer 2

in bifocal lenses the upper part is concave lens and the lower part is convex lens