A double convex lens made of glass of refractive index \( 1.5 \) and radii of curvature of the curved surfaces \( 20 \text{cm} \) each is immersed in a liquid of refractive index \( n_{L} \). The correct plot showing the variation of the power, in the units of diopter \( (D) \), as a function of \( n_{L} \) is:
