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4 = s'/s
s' = 4s
1/f = 1/s + 1/s'
1/20 = 1/s + 1/4s
1/20 = 4/4s + 1/4s
1/20 = 5/4s
4s = 20.5
4s = 100
s = 100/4 = 25 cm
s' = 4s = 4.25 = 100 cm
M = s'/s4 = s'/ss' = 4s
1/f = 1/s + 1/s'1/20 = 1/s + 1/4s1/20 = 4/4s + 1/4s1/20 = 5/4s4s = 20.54s = 100s = 100/4 = 25 cms' = 4s = 4.25 = 100 cm
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