A simple magnifying glass consists of a

The correct option is C

convex lens of small focal length

Correct answer- C

1. A simple magnifier is a converging lens that magnifies a virtual picture of an object within the focal length of the lens.
2. Magnifying glasses are larger, have a focal length of $125$ mm or more, and are normally used at a greater distance from the eye.
3. A basic magnifier is a convex lens that enlarges the image of an object on the retina.
4. A convex lens is a converging lens, meaning that after refraction, the light rays entering the lens will converge at a point.
5. Convex lens with a shorter focal length produces a bigger image.
6. As a magnifying glass, a convex lens with a short focal length is utilized.

Hence, the correct answer is a convex lens of a small focal length.