Question

i) Name the defect shown in figure.
ii) Give two possible reasons for this defect of eye in
human beings.
iii) Name the type of lens used to correct this eye defect.
iv) Draw a labelled diagram to show how the defect is
rectified by using a lens.​

Answer 1

Answer:

2. There are mainly three common refractive defects of vision. These are (i) myopia or near-sightedness (ii) Hypermetropia or far – sightedness (iii) Presbyopia. Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly but cannot see distant objects distinctly.

3...To correct this defect, one has to use a corrective lens. This lens should be biconcave in nature with a negative power (or negative focal length). The Biconcave lens is a diverging lens.