Ответ:
1/F = 1/d + 1/f = 1/60 + 1/20
1/F = 4/60
F = 15 см
D = 0.07 дптр
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Ответ:
1/F = 1/d + 1/f = 1/60 + 1/20
1/F = 4/60
F = 15 см
D = 0.07 дптр