Question

5. For a normal eye, the far point is at infin-
ity from the eye lens. The image is formed
at the retina, which is 2.5 cm away from
the eye lens. What is the power of the
eye lens ?
1) 4D
2) 40 D
3) - 40 D 4) 44D​

Answer 1

power of lens equals to 100 / focal length of the lens in cm

hence the power of the lens is 40d