Question

i need answer with explanation..​

Answer 1

Answer:

Here, image distance, v = -75 cm

object distance, u = -25 cm

so, the focal length will be

1/f = 1/v - 1/u

or

1/f = 1/25 - 1/75

or

1/f = 0.027

thus, f = 37.03 cm = 0.37 m

The power of the lens would be,

P = 1/f so, P = 1/0.37 = 2.70 Dioptre.

Answer 2

Answer:

The answer will be 2.7 dioptre