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2014-05-26T13:29:13+07:00
 \frac{1}{f} =  \frac{1}{s} + \frac{1}{s'}
= \frac{1}{25} + \frac{1}{-200}
= \frac{8}{200} + \frac{-1}{200}
= \frac{7}{200}
f= \frac{200}{7} =28,57
P=  \frac{100}{f}
= \frac{100}{28,57}
=3,5 dioptri

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