Ravi is unable to view the black baord clearly, situated 5m away from him.
i) What kind of defect that Ravi is suffering ?
ii) Draw the ray diagram describing the correction.
Answers
Answer:
(i) Ravi is suffering from myopia.Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly but cannot see distant objects distinctly. A person with this defect has the far point nearer than infinity. Such a person may see clearly upto a distance of a few metres. In a myopic eye, the image of a distant object is formed in front of the retina and not at the retina itself. This defect may arise due to: (1) excessive curvature of the eye lens, or (2) elongation of the eyeball.
(ii) This defect can be corrected by using a concave lens of suitable power. A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.
Diagram is shown above
Explanation:
Hope it helps!
