Question

a person needs a lens of power + 2.5 diopter for correcting his vision. name the defect of vision he is suffering from. Which type of lens will he be using for the correcting the defect? Also, find the focal length of lens.

Answer 1

he is suffering from hypermetropia and would use convex lens for correcting it.
the focal length will be 1/2.5 metre = 40 cm

Answer 2

The answer is 40 cm
Hope this will help you.