Physics Optics Refraction and Reflection

Three identical convex lenses each of focal length f are placed in a straight line separated by a distance f from each other. An object is located at f/2 in front of the leftmost lens. Then, 

1
Final image will be at f/2 behind the rightmost lens and its magnification will be −1.
2
Final image will be at f/2 behind the rightmost lens and its magnification will be +1.
3
Final image will be at f behind the rightmost lens and its magnification will be −1.
4
Final image will be at f behind the rightmost lens and its magnification will be +1.

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