Question

| 35.
30. Which of the following statements is/are
true?
(a) A convex lens has 4 dioptre power
having a focal length 0.25 m
(6) 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:

d

Explanation:

because i dont know hshskskvekdvdj ehd heCisbvsid bisve

Answer 2

ab are true

Explanation:

because

power of lens(D)=1/focal length

hence focal length=1/0.25

=100/25

=4D