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h' = 1/16 h
M = h'/h
= 1/16 h / h
= 1/16
M = -s'/s
1/16 = -s'/2
-s' = 2/16
s' = -1/8
1/s + 1/s' = 1/f
1/2 + 1/ -1/8 = 1/f
1/2 + -8 = 1/f
-17/2 = 1/f
-8,5 cm = f