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dane: D= 6 dioptrii = 6*1/m, n=1,6 r1=nieskończoność,bo powierzchnia płaska
1/r1 = 0
szukane: r2
1/f = [n - 1][1/r1 + 1/r2]
D = [n - 1]/r2
r2 = [n - 1]/D = 0,6/[6/m] = 0,1m = 10cm
....................pozdrawiam