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CBSE Class 10 Answered

I am totally confused that what values for object and image distance should I take while solving the numericals involving the task of finding the corrective focal length of a myopic and hypermetropic eye????
Asked by | 01 Mar, 2012, 10:24: AM
Expert Answer
A person affected by hypermetropia has a shorter-than-normal eye ball, making the
retina too close to the lens system. This causes images of near objects to be formed
behind the retina.
For Myopic :
concave lens is used to correct it and value of u is to reduce the focal length of concave lens from original object distance.
v = focal length of concave lens.
For hypermetropia:
For the object distance, increase the distance of object by focal length of convex lens
and final image distance will be focal length of the convex lens
Answered by | 01 Mar, 2012, 12:00: PM
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