1/F=1/d+1/f=(d+f)/df
F=df/(d+f)
F=0.3*0.15/(0.3+0.15)=0.1(Дптр)
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1/F=1/d+1/f=(d+f)/df
F=df/(d+f)
F=0.3*0.15/(0.3+0.15)=0.1(Дптр)