4
Question Given below is a diagram depicting a defect of the human eye? Study the same and answer the questions that follow:
(a) Name the defect shown in the diagram.
(b) Give two possible reasons for this defect.
(c) Name the parts labelled 1 to 4.
(d) Name the type of lens used to correct this eye defect.
(e) Draw a labelled diagram to show how the above mentioned defect is rectified using the lens named above.
(a) Myopia
(b) The two possible reasons for myopia are either the eye ball is lengthened from front to back or the lens is too curved.
(c) Parts labelled 1 to 4 are:
- 1 → vitreous humour
- 2 → blind spot
- 3 → lens
- 4 → pupil
(d) Concave lens
(e) The below diagrams show the condition of Myopia and how it is corrected using a Concave Lens:
