a spherical convex surface seperates object and image space of refractive index 1.0and4/3.if radius of curvature of the surface is 10cm,its power is

$\mu$2 / v – $\mu$1 / u = ($\mu$2 – $\mu$1 )/ R
$\mu$2 / f – $\mu$1 / infinity = ($\mu$2 – $\mu$1 )/ R
f = R $\mu$2 / ($\mu$2 – $\mu$1)