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

Question: 1 / 400

What type of lens is described as being stacked apex to apex?

Concave lens

Plus lens

Minus lens

The correct answer is identified as a plus lens. A plus lens is also known as a convex lens, which is shaped in such a way that it converges light rays that are entering it. When plus lenses are described as being stacked apex to apex, it refers to how the curved surfaces of the lenses (the apex being the most outwardly bulging part) are aligned with each other. This arrangement enhances the lens's ability to converge light even further, increasing its magnifying power.

This stacking method emphasizes the construction and optical properties of the lens, particularly in applications that require enhanced focal lengths or magnification, making plus lenses particularly advantageous in various optical devices such as magnifying glasses or corrective eyewear for hyperopia (farsightedness).

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Convex lens

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