Question

iv
Which of the following is the power of a convex lens having focal length 20 cm?
(a) 4D ((b)6 D (c) 20 D (d)5 D (e) None of these​

Answer 1

Answer:

D) 5 D

Hope my answer helps u

Answer 2

Answer:

(d) 5 D

Explanation:

f = 20cm

or f = 0.2m

or f = $\frac{2}{10}$m

We know,

P = $\frac{1}{f}$

or P =$\frac{10}{2}$ D

or P = 5 D

I hope it will help you.