4. 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 labeled 1 to 4.

(d) Name the type of lens used to correct this eye defect.

(e) Draw a labeled diagram to show how the above-mentioned defect is rectified using the lens named above.

Solution:-

(a) The defect shown in this diagram is Myopia.

(b) The eyeball is lengthened from front to back or the lens is too curved.

(c)

1 represents vitreous humour

2 represents blind spot

3 represents lens

4 represents pupil

(d) A concave lens is used to correct this eye defect.

(e)