A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
The person is suffering from myopia (near-sightedness), a condition where nearby objects can be seen clearly but distant objects appear blurred. In a myopic eye, the image of a distant object is formed in front of the retina instead of at the retina itself.
To restore proper vision, a concave lens of suitable power should be used. The concave lens diverges the light rays entering the eye, which helps bring the image back onto the retina. This corrects the defect and enables the person to see distant objects distinctly.
Explanation
The NCERT textbook clearly states that myopia is corrected by using a concave lens of suitable power. The context explains that in myopia, 'the image of a distant object is formed in front of the retina' and 'a concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.' Since the person cannot see beyond 1.2 m distinctly, their far point has shifted from infinity to 1.2 m, confirming myopia.