Question

(a) What are the values of (i) near point and (ii) far point of vision of a normal adult person?; (b) A student has difficulty in reading the blackboard while sitting in the last row. What could be his defect of vision? Draw a ray diagram to illustrate this defect of vision.(All India - 2011)

Answer 1

The normal point of near vision is 25cm for a young adult and the far point is infinity

Explanation:

• A young person with perfect eyesight can see between 25cm and infinity
• The student has Myopia
• It is a condition which makes distant things appear blurry
• It is also called nightsightedness and most people have this type of eye vision problem

Learn more about eye vision here:

Defect of vision explain

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