. The magnification by a lens is plus 0.5
The magnification by a lens is +0.5. Name the lens and state how are u and v related?
The image formed by the concave lens is always virtual, erect and smaller than the object. Hence, the magnification is always positive and less than 1
The relation between u and v is
m = v / u
0.5 = -v / -u
1 / 2 = v / u
u = 2v
Hence, the object distance is twice that of image distance.