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1/So + 1/Si = 1/f = 1/30 + 1/Si = 1/15, 1/Si = 2/30 - 1/30 , 1/Si = 1/30 , Si = 30 cm
2. P = 1/f , f = 0,5 m = 1/1/2 dioptri = 1 x 2 = 2 dioptri