284
CHAPTER 23
23.32
Comparing the given equation to the thin lens equation,
1
1
1
p
q
f
+
=
, we see that the lens
is a convergent lens
(
)
0
f
>
with focal length
7.50 cm
f
=
. Also, the image distance is
negative
(
)
3.50
q
= −
p
, meaning the image is virtual. The lateral magnification is
3.50
q
p
p
p
−
= +
3.50
M
= −
= −
so the image is upright and enlarged.
(a)
Using the information deduced above, the thin lens equation becomes
1
1
1
3.50
7.50 cm
p
p
−
=
giving
(
)
1
7.50 cm
1
5.36 cm
3.50
=
−
= +
p
(b)
The image distance is then
(
)
3.50
5.36 cm
18.8 cm
q
= −
= −
(c)
See the ray diagram at the right.
(d)
A simple magnifier is a device that uses a convergent
lens to form an upright, enlarged, virtual image of a real
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 Spring '09
 Physics, Work

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