Question

if for a concave lens f=-20 what is the pawer of the lens​

Answer 1

Answer. Given that, Focal length of a concave lens, f = -20 cm = 0.2 m (negative for concave lens.

Answer 2

given:-

• f = -20m

formula of power:-

$\underline{\boxed{\sf power = 1/f (in m)}}$

solution:-

p = 1/-20

p = -0.05 D