25.59. Set Up:
The person’s eye cannot focus on anything closer than 85.0 cm. The problem asks us to find the
location of an object such that his old lenses produce a virtual image 85.0 cm from his eye.
Solve: (a)
so
The image is 85.0 cm from his eye so is 83.0 cm from the eyeglass
lens.
The object is 28.9 cm from the eyeglasses so is 30.9 cm from his eyes.
(c)
Now
Reflect:
The old glasses allow him to focus on objects as close as about 30 cm from his eyes. This is much better than
a closest distance of 85 cm with no glasses, but his current glasses probably allow him to focus as close as 25 cm.
25.60. Set Up:
Solve: (a)
(b)
so
(c)
is the angular size of the object;
25.61. Set Up:
For a doubleconvex lens,
and
The length of
the telescope is
Solve: (a)
Find the focal length of each lens.
and
and
The largest magnification would be with
as the objective and
as the eyepiece.
(b)
The length of the telescope would be
25.62. Set Up:
Jupiter has a diameter of
For
a spherical mirror
so
We want
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg

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