Question

(e) Given below is a diagram depicting a defict of human eye, study and then answer the questions:

(i) Name the defect shown in diagram.

(ii) What are 2 possible reasons of defect.

(iii) Name type of lens used to correct this defect.

(iv) With the help of diagram show how the defect shown above is rectified using a suitable lens.​

Answer 1

Name of the defect: Myopia

Explanation:

Myopia is the defect in which the image is formed in front of the retina.

Two reasons for Myopia or short-sightedness:

1, Eyeball is too long in comparison to the focusing power of the cornea.

2. If the cornea is too curved relative to the eyeball.

This defect and be corrected by using a concave lens of a suitable focal length.