Optic axis of a thin equi-convex lens is the \( x \)-axis. The co-ordinates of a point object an...

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Optic axis of a thin equi-convex lens is the \( x \)-axis. The co-ordinates of a point object and its image are \( (-40 \mathrm{~cm}, 1 \mathrm{~cm}) \) and \( (50 \mathrm{~cm},-2 \mathrm{~cm}) \), respectively. Lens is located at
(a) \( x=20 \mathrm{~cm} \)
(b) \( x=-30 \mathrm{~cm} \)
(c) \( x=-10 \mathrm{~cm} \)
(d) origin
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