It is known as a mirage.
If the forces acting on an object are balanced, then the object will do none of those things. The statement is false.
The image formed at the retina is always real and inverted but the brain interprets it as erect. the object you see will not be inverted.
False It should read: The amount of matter in an object is its mass (not weight)
The object and image distance are interchangeable, because this gives rise to points of conjunction, a point on an object has a conjugate point on the image, both will yield the same value for f and it is a property of optical systems known as reversibility.
The size of the plan mirror should be half the size of the object to get a full size image of the object