LONG SIGHTEDNESS
OR
HYPER METROPIA
 
SYMPTOMS
 
    In HYPER METROPIA, a person can not see objects clearly which are near to him, but he can see clearly     distant objects
REASON
 
    The reason for HYPER METROPIA is that either the focal length of the lens of eye is too long or the     eyeball is too short.
WHAT HAPPENS IN
HYPER METROPIA
 
    In HYPER METROPIA, light rays from a near object are focused behind the Retina.
CORRECTION OF DEFECT
 
    This defect can be corrected by using a convex lens of suitable focal length
    For latest information , free computer courses and high impact notes visit : www.citycollegiate.com
POWER OF LENS
    Power of lens is defined as the reciprocal of the focal length of the lens in meters.
    FORMULA:
Power = 1/f(in meter)
    Unit of power of lens is Dioptre.
DIOPTRE
 
    Dioptre is defined as the power of lens whose focal length is one meter
    if f =1 meter then the power of the lens = 1 dioptre.
    For latest information , free computer courses and high impact notes visit : www.citycollegiate.com
|PHOTOSHOP|FLASH|SWISH|FLAX|INTERNET|PHYSICS|CHEMISTRY|HOME|