Question

find the power of a concave lens of focal length 2m.​

Answer 1

Answer:

0.5d

Explanation:

P=1/f

or P=1/-2

or P=-0.5d

Answer 2

Focal length of concave lens , f = 2 m

Power of lens ,

$P = \frac {1}{f} = \frac {1}{(-2)} = - 0.5 D$