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What is the distance of the image to this lense

by xinlan
Tags: lens
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Feb23-08, 10:35 PM
P: 61
1. The problem statement, all variables and given/known data

A lens placed at the origin with its axis pointing along the x axis produces a real inverted image at x = -24 cm that is twice as tall as the object

What is the image distance?

2. Relevant equations

m = -d'/d

3. The attempt at a solution

I thought d=24 cm. and h' = -2h
then use m = h'/h to solve for the m. which I got m = -2.
then I used m = -d'/d
-2 = -d'/24
d' = 48 cm.

I don't know where I did wrong..
please help me..
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Feb23-08, 10:53 PM
P: 61
Never mind..
I got it.. :)
Feb24-08, 01:25 AM
P: 23
what did you get wrong>>

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