Step 1: Employ the lens power formula The lens power \( P \) is calculated using its focal length \( f \) via the equation:\[P = \frac{1}{f}\]Definitions:- \( P \) denotes lens power (diopters),- \( f \) signifies focal length (meters).Step 2: Determine \( f \) With a lens power of \( P = +2 \, \text{D} \), substitute this value into the formula:\[2 = \frac{1}{f}\]Solving for \( f \):\[f = \frac{1}{2} = 0.5 \, \text{m}\]Answer: Consequently, the lens exhibits a focal length of 0.5 m. This corresponds to option (1).