294
CHAPTER 23
Thus, the final image is located
160 cm to the left of the lens
The overall magnification is
1
2
1
2
3
1
2
q
q
q
M
M M M
3
3
p
p
p
=
=
−
−
−
, or
(
)
(
)
60.0 cm
400 cm
160 cm
0.800
100 cm
300 cm
160 cm
M
−
=
−
−
−
= −
−
0
Since
M
<
, the final image is
inverted
23.52
(a)
Using the sign convention from Table 23.2, the radii of curvature of the surfaces are
. The lens maker’s equation then gives
1
2
15.0 cm and
10.0 cm
R
R
= −
=+
(
)
(
)
1
2
1
1
1
1
1
1
1.50
1
15.0 cm
10.0 cm
n
f
R
R
=
−
−
=
−
−
−
or
12.0 cm
f
= −
(b) If
p
→
∞
, then
12.0 cm
q
f
=
= −
The thin lens equation gives,
(
)
12.0 cm
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 Spring '09
 Physics, Work, Light, Thin lens

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