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What is a lens called that has only one curve?

  1. Apex

  2. sph/cylindrical

  3. spherical

  4. Concave (-)

The correct answer is: spherical

A lens that has only one curve is referred to as a spherical lens. In optics, a lens with one curved surface and one flat surface is known as a spherical lens. This type of lens can be used for correcting certain vision problems. The other options are not correct: - Apex is the highest point or tip of a lens. - Sph/cylindrical refers to a combination of a spherical lens and a cylindrical lens, typically used in eyeglasses for astigmatism correction. - Concave (-) refers to a lens surface that curves inward, causing light rays to diverge.