A lens has a power of +5 diopters in air. What will be power if completely immersed in water? $_a \mu_w =\large\frac{4}{3}$ and $_a \mu_g =\large\frac{3}{2}$

Question

$(a)\;1.25\;diopter \\ (b)\;2 diopter \\ (c)\;2.25\;diopter \\ (d)\;1\;diopter $