Optical axis of a thin equiconvex lens is the x-axis. The co-ordinate of a point object and its image are (–20 cm, 1 cm) and (40 cm, – 4 cm) respectively -
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(b, c)
m = 
= – 4
v + u = 60
⇒ u = 12, v = 48
= 
⇒ f = 
= 9.6 cm
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