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Optical Instruments
359
(b) When the object distance is
33.0 cm
p
=
, the corrective lens should produce parallel
rays
( )
q
→
∞
. Then the implanted lens will focus the final image on the retina.
From the thin lens equation, the required focal length is
33.0 cm
fp
=
=
, and the
power of this lens should be
11
s
0.330 m
==
=
P
3.03 diopter
+
corrective
f
25.52
When viewed from a distance of 50 meters, the angular length of a mouse (assumed to
have an actual length of
≈
) is
10 cm
3
2.0
10
−
= ×
0.10 m
radians
50 m
s
r
θ
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This document was uploaded on 10/20/2011.
 Spring '09
 Physics, Work

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