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M=
h'=M.h=1,66 x 3 = 4,99
1/s+1/S'=1/f
1/6+1/S'=1/15
1/S'=1/15-1/6
1/S'=2/30-5/30
1/S'=-3/30=1/10
S'=-10
sekarang kita cari tinggi bayangan dengan rumus
h'/h=s'/s
h'/3=10/6
6h'=30
h'=5
tinggi bayangan adalah 5 cm