Jawabanmu

Jawaban paling cerdas!
2014-05-29T21:18:40+07:00
Dik : s = 30 cm
        f  = 20 cm
dit : s' =....?
      M = .....?
jawab:
 \frac{1}{f} =  \frac{1}{s} + \frac{1}{s'}
 \frac{1}{20}  =  \frac{1}{30}+ \frac{1}{s'}
 \frac{1}{s'} =  \frac{1}{20}- \frac{1}{30}
 \frac{1}{s'}  =  \frac{3}{60}- \frac{2}{60}
 \frac{1}{s'} =  \frac{1}{60}
s' =  \frac{60}{1}
s' = 60 cm

M =  \frac{s'}{s}
M =  \frac{60}{30}
M = 2 X