1.

A convex lens forms a real image of a point objectat a distance of 50 cm from the convex lens. Aconcave lens is placed 10 cm behind the convexlens on the image side. On placing a plane mirroron the image side and facing the concave lens, itis observed that the final image now coincides with(the object itself. The focal length of the concavelens is3.(1)/50 cm(2) 20 cm(4) 25 cm40 cm

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option 3



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