Jawabanmu

2014-05-03T13:06:21+07:00
1/s aksen = 1/f - 1/s = 1/9 - 1/6 = -2/36
jarak bayangan -18
2014-05-03T13:10:16+07:00
Diket:
s = 6cm
R = 18 cm
f =  \frac{1}{2}R  

  =  \frac{1}{2}.18

  = 9

dit: s' ?

jwb:

 \frac{1}{f}=  \frac{1}{s} + \frac{1}{s'}

 \frac{1}{s'}= \frac{1}{f} - \frac{1}{s}

 \frac{1}{s'}= \frac{1}{9} - \frac{1}{6}

 \frac{1}{s'} = \frac{2-3}{18}

 \frac{1}{s'}= \frac{-1}{18}

s' = -18