Question

Focal length of a lens is 50 cm. In dioptre power of lens will be​

Answer 1

Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D.

Answer 2

Answer:

Explanation:

convex ( so focal length is positive )

given : f = 50cm or +50×10^-2m

so find p =?

formula p =1/f

p = 1/50×10^-2

p= 100/50

P = 2

so your final answer is 2