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f= 8 cm
hi= 2cm
M= Si/So = hi/ho
Si/So=2/4
Si.4 = 2So
So=2Si
1/f=1/So+1/Si
1/8=1/2Si + 1/Si
1/8=1/2Si + 2/2Si
1/8 = 3/2 Si
2Si= 8.3
Si= 24/2= 12 cm
So=2. So=2.12=24 cm