1. (i) Name the defect shown in the diagram.   2. (ii) Give two possible reasons for this defect of the eye in human beings.   3. (iii) Name the parts labelled 1 to 4.   4. (iv) Name the type of lens used to correct this eye defect.   5. (v) Draw a labelled diagram to show how the above mentioned defect is rectified using the lens named above.