Question

What are the two defects of vision ? What are the cause s and its corrections? Explain wth te hlp of diagrams?

Answer 1

the two defects of vision are myopia and hyper metropia.

Causes of Myopia:

1. the elongation of the eye ball
2. the excessive curvature of the cornea

Correction of Myopia:

1. this defect can be corrected by using concave lens of suitable focal lens.

Causes of Hypermetropia:

1. the size of eye ball become too small
2. the increase in focal length

Correction of Hypermetropia:

1. this defect corrected by using convex lens

Ray diagram for correction of myopia

Ray diagram for correction of hypermetropia

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