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Perbesarannya itu
1/f = 1/s + 1/s'
1/4 = 1/20 + 1/s'
1/4 - 1/20 = 1/s'
5/20 - 1/20 = 1/s'
4/20 = 1/s'
S' =20 : 4
S' =5
M= s/s'
M= 20/5
M= 4