Question

The power of a lens is + 2 dioptre then its focal length will be :
A. 2 metre
B. 1 metre
C. 0.5 metre
D. 0.2 metre

Answer 1

Answer:

C is correct answer 0.5 metre.

Explanation:

according to the formula of power p=1/f and p=2 diopter. so from this f=1/p and f= 1/2 so focal length will be 0.5 metre.