Question

Which of the following statement is true? [NCERT Exemplar]
(a) A convex lens has 4D power having a focal length 025 m
(b) A convex lens has 4D power having a focal length -025 m
(c) A concave lens has 4D power having a focal length 025 m
(d) A concave lens has 4D power having a focal length -025 m

Answer 1

Answer:

it should be A is the correct answer