- #1
Kay Oss
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Homework Statement
Two converging lenses, each of focal length
14.7 cm, are placed 39.7 cm apart, and an
object is placed 29.3 cm in front of the first.
How far from the first lens is the final image
formed? What is the magnification of the system?
Answer in units of cm.
Homework Equations
1/f = 1/di + 1/do
do is the distance to the object from the lens while di is the distance of the image from the lens
M = - di/do
The Attempt at a Solution
I know:
f1 = 14.7
f2 = 14.7
do1 = 29.3
separated by 39.7
to find di1:
1/( 1/f1 - 1/do1) = 29.50068493
To find do2 I did the separeted - di1 to get 10.19931507
Finally di2 = 1 / ( 1/14.7 - 1/10.19931507) = -33.31269215
To find the image position I added 39.7 + (-33.31269215) + 29.50068493 = 35.88799278 I enter this as my final answer but got it wrong. I thought that possibly di2 should be positive. I added again to get 102.5133771 but this answer was also wrong.