Question

The power of a equi-concave lens is $-4.5$ and is made of an material of R.I. $1.6$, the radii of curvature of the lens is

• A. -2.66 cm
• B. 115.44 cm
• C. -26.6 cm
• D. +36.6 cm

Answer 1

Answer: (C)

$p=\frac{1}{f}=(\mu -1)\left(\frac{1}{-R}-\frac{1}{R}\right)$