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Chapter 36
351
P36.3
The flatness of the mirror is described
by
R
=∞
,
f
and
1
0
f
=
.
By our general mirror equation,
111
0
pq f
+==
or
qp
=−
.
FIG. P36.3
Thus, the image is as far behind the mirror as the person is in front. The magnification is then
M
q
p
h
h
=
−
==
′
1
so
′
hh
70 0
.
in
ch
e
s
.
The required height of the mirror is defined by the triangle from the person’s eyes to the top and
bottom of his image, as shown. From the geometry of the triangle, we see that the mirror height
must be:
′
−
F
H
G
I
K
J
=
′
F
H
G
I
K
J
=
′
h
p
pq
h
p
p
h
22
.
Thus, the mirror must be
at least 35.0 inches high
.
P36.4
A graphical construction produces 5 images, with images
I
1
and
I
2
directly into the mirrors from the object
O
,
and
OI I
,,
34
bg
and
III
215
forming the vertices of equilateral triangles.
FIG. P36.4
P36.5
(1)
The first image in the left mirror is 5.00 ft behind the mirror, or
10 0
f
t from the position of
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .
 Fall '11
 Staff
 Physics

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