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Answer to Question #74249 in Optics for Sanskriti Sharma
Question #74249
A convex lens forms a real image of a point object at a distance of 50 cm from the convex lens. A concave lens is placed 10 cm behind the convex lens on image side. On placing a plane mirror on the image side and facing the concave lens, it is observed that the final image now coincides with the object itself. The focal length of the concave lens is?
a) 50 cm b)20cm c) 40 cm d) 25 cm
a) 50 cm b)20cm c) 40 cm d) 25 cm
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