D1=1/2=0.5D_1=1/2=0.5D1=1/2=0.5 dioptres
D2=1/0.5=2D_2=1/0.5=2D2=1/0.5=2 dioptres
D3=1/50=0.02D_3=1/50=0.02D3=1/50=0.02 dioptres
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