d = 25 cm, f0 = 8 mm = 0.8 cm
fe = 2.5 cm, u0 = – 9 mm = – 0.9cm.
1/ue = 1/ve - 1/fe = 1/-25 - 1/2.5 = (-1 - 10)/25 = -11/25
∴ ue = - 25/11 = - 2.27cm
1/v0 = 1/u0 + 1/f0 = 1/-0.9 + 1/0.8 = (-0.8 + 0.9)/0.72 = 0.1/0.72
∴ v0 = 0.72/0.1 = 7.2cm. eperation between two lens = 2.27 + 7.2 = 9.47 cm.
magnifying power, m = v0/|u|(1 + d/fe) = 7.2/0.9(1 + 25/2.5) = 88