Question

Which
of the
the following statement is true?
a)a convex lens has 4 diopture power having a focal length of 0.25m.
b)a convex lens has -4 diopture power having a focal length of 0.25m.
c)a concave lens has 4 diopture power having a focal length of 0.25m.
d)a concave lens has -4 diopture power having a focal length of 0.25m.

I am only conforming the answer ​

Answer 1

Answer:

(a)a convex lens has 4 disputer power having a focal length of 0.25