Ramesh cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

Ramesh is suffering from Myopia (nearsightedness), a defect where a person can see nearby objects clearly but cannot see distant objects distinctly. In this case, his far point is 2 m instead of infinity.

To correct Myopia, a concave (diverging) lens is used. The lens must form a virtual image of a distant object (at infinity) at the person's actual far point. Using the lens formula:

• Object distance (u) = ∞
• Image distance (v) = -2 m (far point)
• Lens Formula: 1/f = 1/v - 1/u
• 1/f = 1/(-2) - 1/∞ = -1/2 = -0.5 m⁻¹

The Power (P) of a lens is defined as the reciprocal of its focal length in meters (P = 1/f). Therefore, P = -0.5 D. The negative sign indicates that the lens is concave, which is consistent with the treatment for Myopia.