The erect image formed when completed is placed between f and lens.
What is focus?
The focus is twice the radius of curvature of lens and all the light from the objects passes from the focus point.
When an object or arrow is placed between the focus and concave lens, the image formed is erect or above the principle axis.
In all the other cases, the image is formed inverted in nature.
Thus, the erect image formed when completed is placed between f and lens.
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