A student is suffering from hypermetropia and is not able to see distinctly the object placed closer than 0.5,cm
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There are some possible reason due to this defect of vision may have arisen :
(a) elongation of eyeball
(b) excessive curvature of the lens.
(i) student unable to see distinctly the objects placed beyond 5m from his eyes because student suffering with myopia . A myopic eye can't see distinct object clearly but able to see nearby object clearly.
(ii) convex lens of suitable focal length is used to restore proper vision. After using convex , image formed at ratina. While before it , image was formed near the ratina . As shown in figure it is clear how the lens correct this type of defect.
b. Focal length of convex lens is positive
So, f = +5m
Now, Power = 1/f = +1/5 = +0.2D
Hence, power is +0.2 diopter
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