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.  

Answer 1

(a) (i) 25 cm (ii) Infinity (∞) 

(b) Short-sightedness or myopia: The image in this case forms in front of the retina.