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x=20cm=0,2m
y=80cm=0,8m
1/f=1/x+1/y
f=xy/(x+y)
f=0,2m*0,8m/(0,2m+0,8m)=0,16m²/1m=0,16m
z=1/f
z=1/0,16m=6,25D
2.
x=60cm=0,6m
y=1,2m
f=xy/(x+y)
f=0,6m*1,2m/(0,6m+1,2m)=0,72m²/1,8m=0,4m
z=1/f
z=1/0,4m=2,5D