Jawabanmu

2014-05-28T20:47:24+07:00
1/f = 1/s + 1/s'
1/f = 1/3 + 1/50
1/f = 53/150
f = 150 : 53
  = 2,8
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2014-05-28T20:51:34+07:00
1/f = 1/s + 1/s'
1/f = 1/300 + 1/50 = 1/300 + 6/300 = 7/300
f = 300/7 = 42,85 cm
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