Question

The power of lens is - 2D. What is its focal length?; 1) 2m; 2) 0.5m; 3) 1.0m; 4) 0.5m

Answer 1

1. 0.5d
2. 1/0.5d
3. 1d
4. 1/0.5d

Answer 2

0.5m
.. 2) & 4) options are same