The magnification of the camera is 0.075.
What is magnification?
The magnification is the ratio of the image distance and the object distance.
Magnification = image distance / object distance
Given is the image formed behind lens v=3.0cm and the tree distance u =40 cm
Left of the lens is taken negative and its right is taken positive.
So, M = - v/u
Substitute the value, we get
M = -3/(-40)
M = 0.075
thus, the magnification is 0.075
Learn more about magnification.
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