Mirrors and Lenses
273
23.6
The lateral magnification is given by
M
qp
= −
. Therefore, the image distance is
( )
()
0.013 0
30.0 cm
cm
qM
p
=−
0.390
The mirror equation:
211
Rpq
=+
or
2
pq
R
p
q
=
+
gives
( )
2
30.0 cm
0.790 cm
390 cm
R
==
0.390 cm
30.0 cm
0.
−
−
−
The negative sign tells us that the surface is convex. The magnitude of the radius of
curvature of the cornea is
0
7.90 mm
R
.790 cm
23.7
The radius of curvature of a concave mirror is positive, so
R
20.0 cm
= +
. The mirror
equation then gives
10.0 cm
121
1
1
10.0 cm
10.0 cm
p
qRp
p
p
−
=−=
−=
, or
( )
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 Spring '09
 Physics, Work

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