Jawabanmu

2014-04-03T12:29:21+07:00
1/f = 1/s + 1/s' , 1/15 = 1/10 + 1/s' , 1/15 - 1/10 = 1/s' , 2/30 - 3/30 = 1/s' , -1/30 = 1/s', -30 = s' , ( minus artinya diblakang cermin)
1 1 1
2014-04-03T14:09:39+07:00
1/f = 1/s + 1/s' , 1/15 = 1/10 + 1/s' , 1/15 - 1/10 = 1/s' , 2/30 - 3/30 = 1/s' , -1/30 = 1/s', -30 = s' , ( minus artinya diblakang cermin)
1 5 1