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r=90cm
1/f=1/x+1/y
1/y=1/f-1/x
1/y=(x-f)/fx
y=fx/(x-f)
f=r/2
f=45cm
y=1350:(-15)
y=90cm
powstanie obraz pozorny
p=y/x -powiększenie
p=90cm:30cm
p=3