Question

please give me answer ​

Answer 1

Explanation:

सही में चौथा है विकल्प

Answer 2

Option (b) 0.5.

Explanation:

P = 1/f.

2 = 1/f.

We should find focal length. So,

f = 1/P.

f = 1/2.

f = 0.5m.