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y= 20cm= 0,2m
z= 8 d
z= 1/f
f= 1/z
f= 1/8m
1/f = 1/x + 1/y
8= 1/x + 1/0,2
1/x= 8 - 5
1/x= 3
x= 1/3m
2. x= 0,4m
y= ?
z= 4d
f= 1/4 m
1/f = 1/y + 1/x
4= 1/0,4 + 1/y
1/y = 4- 2,5
y= 2/3 m