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) The defect shown above is myopia or short-sightedness.
(b) There are two possible reasons for myopia which is either the eyeball is lengthened from front to back or the lens is too curved.
(c) 1 - vitreous humour
2 - blind spot
3 - lens
4 – pupil
(d) Concave lens
(e)
4