Question

A person is unable to see objects nearer than 50 cm. He wants to read a book placed at a distance of 25 cm. Find the nature, focal length and power of the lens he requires for his spectacles.

Answer 1

This person has the defect of Hypermetropia which is far sightedness that, means that image is formed beyond the retina so it requires a convergent lens to get focused at retina.

Now corrective measure is