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A convex lens produces a double size real image when an object is place at a distance of 18 cm from it. Where should the object be place to produce a triple size real image?
the distance between object and the lens, u = 18cm
The magnification of the real image is given as m= -2
Now, using lens maker’s formula,
Now, the required magnification m=-3 =v/u
Again,
Hence, the object should be placed 16 cm from lens