f=2 d=0.5 F=?
1/F=1/f+1/d F=f*d/(f+d)=2*0.5/(2+0.5)=0.4 м
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f=2 d=0.5 F=?
1/F=1/f+1/d F=f*d/(f+d)=2*0.5/(2+0.5)=0.4 м
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