ABO NOCE Practice Test 2026 - Free Optician Certification Practice Questions and Study Guide

The configuration of lenses by stacking them base to base forms a minus lens. This type of lens, commonly known as a concave lens, diverges light rays that are incident on it. When two concave lenses are aligned in such a manner, the resulting focal length becomes more negative, effectively increasing the lens's ability to diverge light.

In optics, the essential characteristic of a minus lens is its concave shape, which causes light rays that are coming in parallel to spread apart after passing through the lens. This property is utilized in various optical devices to correct for nearsightedness (myopia) by allowing the eye to focus light correctly on the retina.

Understanding this configuration is important in both practical applications and theoretical principles of optics, as it highlights how the arrangement of optical components can significantly influence their collective behavior.