The image formed is virtual because it cannot be formed on a screen by observation with the eyes. It is also on the same side as the object. Both converging and diverging lenses produce virtual images. However, only the converging lens produces real images.
To differentiate between a converging and a diverging lens, I will increase the object distance.
Assume that you get a lens 6 from your TA and set up the lens system with the light source. At some object distance and image distance, you can only see a sharp image with your eyes. How can you tell this lens 6 is a converging lens or a diverging lens?
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