Biomedical Engineering Reference
In-Depth Information
3
2
1
F
′
I
O
F
Figure 4-8.
When an object is located within the focal length of a plus lens, the image
is located on the same side of the lens as the object (and farther from the lens than
the object), virtual, enlarged, and erect. Rays 1, 2, and 3 are described in the text.
2
3
1
F
O
I
F
′
Figure 4-9.
A minus lens creates a virtual, minified, and erect image on the same side
of the lens as the object (and closer to the lens than the object). Rays 1, 2, and 3 are
described in the text.
