Optic axis of a thin equiconvex lens is ...

Optic axis of a thin equiconvex lens is the x-axis. The co-rodinates of a point object and its image axis `(-40 cm, 1 cm)` and `(50 cm, -2 cm)` respectively. Lens is located at

`x = +20 cm`

`x = - 30 cm`

`x = -10 cm`

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