A farsighted person has a near point of 75 cm rather the normal
25 cm. What strength lens, in diopters, should be prescribed to
correct this vision problem?
Object , o = 25cm, image, i= -75cm(negative, in front of lens)
Martin is severe myopia, with a far point of 15cm. he wants to get a glass that he ‘ll wear while using his computer, whose screen is 75cm away. What refractive power will these glasses required? Object, o=75 cm, image, i=-15cm.
1 / f = 1 / 25 + ( 1 / 75 )
1 / f = 0.04 - 0.0133
1 / f = 0.0267
f = 1 / 0.0267
f = 37.45 cm
or
f = 0.3745 m
strength = 1 / f
= 1 / 0.3745
= 2.67 diapters
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1 / f = 1 / 75 - 1 / 15
1 / f = 0.0133 - 0.066
1 / f = - 0.0527
f = - 1 / 0.0527
f = - 18.97 cm
or
f = - 0.1897 m
the refractive power is
= 1 / f
= - 1 / 0.1897
= - 5.27 diapters
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