Question

A person must hold reading material at a distance greater than 25 cm for clear vision.
(i) What is the name of this visual defect?
(ii) Draw a ray diagram to show its correction.

Hint:

Hypermetropia is corrected by convex lenses that shift the focal point onto the retina.

Answer 1

(i) This defect is called Hypermetropia (farsightedness). It is the inability to see nearby objects clearly.
(ii) Correction: This defect is corrected using a convex lens which converges the light rays before they enter the eye so that they focus correctly on the retina.

Explanation: In hypermetropia, the image is formed behind the retina due to a short eyeball or insufficient curvature of the eye lens.