ABO NOCE Practice Test

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

1. Concave lens

2. Plus lens

3. Minus lens

4. Convex lens

The correct answer is: Plus lens

The type of lens described as being stacked apex to apex is known as a plus lens. In optics, a plus lens, or a convex lens, is thicker at the center than at the edges. When plus lenses are stacked in this manner — apex to apex — they create a combined focal point that gathers light rays, allowing them to converge. This characteristic is crucial for applications like magnification and vision correction for individuals who are hyperopic (farsighted). It's important to recognize that other lenses, such as minus (concave) lenses, do not share this stacking property as they are designed with a thinner center and thicker edges. The stacking method impacts how light interacts with the lenses, which is why plus lenses are distinctively noted for this setup.