Final answer:
People with nearsightedness (myopia) require a concave lens (option b) to correct their vision. This lens type diverges light rays, allowing the image to be focused on the retina for clear distance vision.
Step-by-step explanation:
People who are nearsighted (myopia) require a concave lens to correct their vision. Nearsightedness, or myopia, is characterized by the inability to see distant objects clearly. This vision problem is due to the eye's shape causing light rays to focus in front of the retina instead of on it. To correct this, a diverging lens is needed, and a concave lens serves this purpose by spreading out light rays before they reach the eye. This adjustment helps the image to be focused on the retina, allowing for clear vision at a distance.
Corrective lenses for nearsightedness adjust the optical power of the eye by reducing it, whereas farsightedness, which requires a converging lens like a convex lens, increases the optical power for focusing on close objects. In summary, a concave lens is used for myopia correction.