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z=4D
x=30cm = 0.3m
y=?
z= 1/f
f= 1/z
f= 1/4
f = 0,25 m
1/f = 1/x + 1/y
1/y = 1/f - 1/x
1/y = (x-f)/fx
y = fx/(x-f)
y = 0,25 * 0,3/ (0,3 - 0,25)
y = 0,075/0,05
y = 1,5 m = 150 cm