Which part of the bifocal lens facilitates near vision?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Lower part with convex lens.
The lower part of a bifocal lens is designed to facilitate near vision and typically contains a convex lens segment. Convex lenses are used because they converge light rays, helping to focus images on the retina for closer objects. This correction is necessary for individuals with presbyopia, a condition where the eye's natural lens loses its flexibility with age, making it difficult to focus on nearby objects. By positioning the convex lens in the lower section, it aligns naturally with the eye's position during activities like reading or writing.