ABO NOCE Practice Test

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What type of lens is configured by stacking base to base?

  1. Convex lens

  2. Plus lens

  3. Minus lens

  4. Concave lens

The correct answer is: Minus lens

Stacking lenses base to base results in the configuration of a minus lens. When two concave lenses are stacked together in this manner, the optical effect of the combination is to spread light rays apart, which is characteristic of a minus lens. A minus lens is used to correct myopia (nearsightedness), allowing light rays to focus further from the eye. In contrast, stacking a convex lens base to base or a plus lens would imply convergence, which is the opposite effect. Therefore, while the other choices represent different types of lenses, they do not achieve the same diverging effect that is produced by stacking concave lenses base to base.

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