Biomedical Engineering Reference
In-Depth Information
-10.00 cm
-10.00 D
+6.00 D
I
C
F
′
O
-4.00 D
+25.00 cm
Figure 14-8.
Formation of a virtual, magnified, and erect image by a converging
mirror. See the text for details.
The negative vergence confirms that the image is virtual. As can be seen in
Figure 14-8, which illustrates the solution to this problem, it is formed by diverging
rays and must be located to the right of the mirror. Its exact location is determined
as follows:
−
1
l
′
′
=
L
−
1
′
l
=
−
4.00 D
′
=
l
0.25 m or
+
25.0 cm
What is the magnification? Using the vergence formula for lateral magnification,
we have
L
L
M
L
=
′
−1
0.00 D
M
L
=
−
4.00 D
M
L
= +
2.50
×
This confirms that the virtual image is erect and magnified.
