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s:6cm
h:1cm
ditanya h..
jawab;M h'/h=s'/s
s=1/f=1/s+1/s
=1/s=1/f-1/s
=1/s'=1/3-1/6
=1/s'=6/18cm-3/18cm
=1/s'=1/18--> s'18/1=18
h'/h=s'/s-->h'=s'xh/s
=18x1/6
=3cm