Text-book Questions-Answer:
Page 190 NCERT Book.
Q1. What is meant by power of accommodation of the eye?
Ans: Humans have to organize their eyes to see distant and near objects completely. In this way, the ability of the human eye lens to adjust its focal length angle is called adjusting capacity.
Q2. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
Ans: Concave lens.
Q3. What is the far point and near point of the human eye with normal vision?
Ans: For normal vision, the far point is at an infinite distance from the eye and the near point is at a distance of 25CM from the eye.
Q4. A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
Ans: This student has myopia. Myopia is corrected by a concave lens of suitable power.
