what is the formula of myopia and hyper myopia?
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Explanation:
myopia is also known as nearsightnesses
it is denoted by minus
it is corrected by biconcave
its f is greater than 2.27
- actually i think their is no formula for it once cheek you
- i understood it my depand upon sign converstion by that my v value is changed
- ok
- hyper metropia is also known as farsightnesses
- its f is less than 2.5
- it is denoted by plus
- it is corrected by biconvex
this is extra information that i have
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Answered by
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myopia
- it is near sightness
- image is formed in front of retina
- correction- use concave lens
- causes- 1.excessive curvature of eye lens
2.elongation of eyeball
- in myopia the far point is nearer to infinity
- so we take v=far point of myopia and u=infinity
HYPERMETROPIA
- it is far sightness
- can't see near object
- correction - convex lens
- image is formed behind retina
- causes- 1. eye ball becomes too small
2.focal length increases
- in this case near point recedes away becomes more than 25cm
- we take u= -25cm and v=nearpoint of hyper metropia
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