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2014-05-21T18:57:16+07:00
1/So+ 1/Si = 1/f
1/20 + 1/4 = 1/f
(1+5)/20 =1/f
6/20 =1/f
20/6 = f
3,33 cm = f
1 5 1
2014-05-21T19:00:41+07:00
1/ f = 1 / s + 1 / s'
     = 1/ 20 + 1/ 4
     = 6 / 20
     = 3 / 10
Fokus = 10 / 3