Biomedical Engineering Reference
In-Depth Information
A
O
I
-3.00 m
+3.00 m
B
I
O
Figure 14-5.
A.
The image formed by a plane mirror is virtual and located the same
distance from the mirror as the object.
B.
The image formed by a plane mirror is the
same size as the object.
Recall from Chapter 2 that the power of a spherical refracting surface can be
determined with the following relationship:
n
′
−
n
F
=
r
Referring back to Figures 14-3 and 14-4, we see that both the incident and
reflected rays exist in the primary medium and that the direction of the rays is
reversed after reflection. To use our linear sign convention, this reversal in direc-
tion can be accounted for as follows:
n
′
= −
n
