Г = f/d => f = 3d
1/F = 1/f + 1/d => 1/F = 1/3d+1/d = 4/3d
F = 3d/4 = 180/4 = 45 (см)
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Г = f/d => f = 3d
1/F = 1/f + 1/d => 1/F = 1/3d+1/d = 4/3d
F = 3d/4 = 180/4 = 45 (см)