Question

Which of the following statements is/are true? *
1 point
(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 having a focal 0.25 m

Answer 1

Answer:

The Power of convex lens is positive

p = 1/f

hence,focal length of convex lens is also positive

The required option a."A convex lens has 4 dipotre power having a focal length 0.25m" is correct.