Question

Which of the following statements is true?
5.
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 rm
(d) A concave lens has-4 dioptre power having a focal iength 0.25 m

Answer 1

Answer:

I think (b) is the correct answer