Question

Focal length of a convex lens is 1000 cm find its power

Answer 1

Answer:

see below

Explanation:

The power of a lens is defined as the reciprocal of its focal length.  

Power of lens, D=  

f

1

​  

 

Where D is the power in dioptre and f is the focal length in meters.

1cm=0.01m

⇒P=  

0.01

1

​  

=100D

Hence, the correct answer is OPTION C.