For fixed values of radii of curvature of lens, power of the lens will be _________. Fill in the blank with the correct answer from the options given below.

$P \propto(\mu-1)$ $P \propto \mu^2$ $P \propto 1 / \mu$ $P \propto \mu^{-2}$

$P \propto(\mu-1)$

$ \frac{1}{F} = (\mu -1) (\frac{1}{R_1} - \frac{1}{R_2})$ since radius of curvature is fixed hence $ P = \frac{1}{F} \propto (\mu - 1)$ The correct answer is Option (1) → $P \propto(\mu-1)$