p35 059

background image

59. The fact that it is inverted implies m < 0. Therefore, with m =

1/2, we have i = p/2, which we

substitute into Eq. 35-4:

1

p

+

1

i

=

1

f

1

p

+

2

p

=

1

f

3

30.0

=

1

f

with the unit cm understood. Consequently, we find f = 30/3 = 10.0 cm. The fact that f > 0 implies
the mirror is concave.


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