Question

A convex lense is a focal length 10 cm what is its power ​

Answer 1

f=-10cm

P=1÷f

=1÷-10

=-0.1

=-0.1÷100

=-0.001D

Answer 2

f=10

so, 10 is divided by 1

0.1

and then 0.1 ÷100

0.001D