D=1/F
-1/F= 1/d -1/f
F=- (d-f)/df =- 0,2см= -0,002м
D=- 500 дптр
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D=1/F
-1/F= 1/d -1/f
F=- (d-f)/df =- 0,2см= -0,002м
D=- 500 дптр