Question

7.8 Which of the following statements is true?
(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 m
(d) A concave lens has 4 dioptre power having a focal length - 0.25m ​

Answer 1

Answer:

A) a convex lens has 4 dioptre power having a focal length 0.25 m

Answer 2

.this answer is the .. option b is a answer

a convex lense has 4 dioptre power having a focal length - 0.25