Ryan cannot see objects beyond 1.2m distinctly. He now needs to go and purchase a corrective lens in order to be able to see these objects clearly. Use this information to answer the questions below:
1. What is the defect that Ryan is facing?
(i) Myopia
(ii) Hypermetropia
2. What is the far point of the human eye with normal vision?
(i) Infinity
(ii) 25 cm
3. What formula is used to determine the power of the lens?
(i) Reciprocal of its focal length
(ii) Same as focal length
4. What is the formula for finding the focal length of the lens?
(i) \(\frac1{Power^2}\)
(ii) \(\frac1{Power}\)
(iii) P
5. What is the unit for measuring the power of the lens?
(i) Dioptre
(ii) Millimeter
