Principle focus = The point onto which the rays parallel to the principle axis converge.
Focal length = the distance between the lens axis and principal focus
Converging lens = lens that brings light rays together, changes direction of light rays by refraction
Real image = light rays actually there, image can be captured on screen.
Virtual image = light rays aren't where images appear to be, images can't be captured on screen.
Focal point = the point where light rays originating from a point on the object converge.
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