1. The diagram given represents a defect of vision of the Human Eye
1. Name the defect.
2. What is the effect of the defect?
3. Mention the two causes of defect.
4. How can this defect be rectified? Draw a diagram of rectification of this defect.
5. What is the nature of image that forms on retina of normal eye?
Answers
Answer:
myopias,Hypermetropia and presbyopia
Explanation:
2- In mayopias person can see nearly object clearly but far object can't see clearly .
In Hypermetropia person can see far object clearly but unable to see near object clearly.
In presbyopia this defect comman in old person and is caused by the weakening cliliry muscles . In this defect both near and far point are affected.
3-causes - In myopias for such a person ,far point changes infinity to some finite distance .
In Hypermetropia for such a person, near point increase to a distance greater than 25cm.
in presbyopia happen due to weakening of cliliry muscles .
4- 1- myopias is corrected by use of concave lens.
2- Hypermetropia is corrected by use of convex lens .
3- presbyopia is corrected by use combination of concave and convex lens .