Which one among the following figures correctly represents the ray diagram ? (Consider the lens to be thin)

According to the fundamental principles of geometric optics for a thin convex lens, a correct ray diagram must adhere to the standard rules of refraction as defined in NCERT Class 10 Science:

• Rule 1: Any incident ray traveling parallel to the principal axis will, after refraction, pass through the principal focus (f) on the other side of the lens.
• Rule 2: A ray of light passing through the optical center of a thin lens emerges without any deviation from its original path.

Option D is correct because it accurately illustrates these paths. In a thin lens approximation, we assume the lens has negligible thickness, meaning the ray passing through the center does not shift laterally. These conventions are essential for determining the position, nature, and size of images formed by spherical lenses.