- #1

xinlan

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## Homework Statement

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?

## Homework Equations

m = -d'/d

## 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..

thanks..