- #1

Venerable R

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## Homework Statement

Image: http://i.imgur.com/NMS7BUK.jpg?1

a) Find the position of the final image of the 1.0-cm-tall object.

b) Find the size of the final image of the 1.0-cm-tall object.

h = 1 cm

f1 = 5 cm

do = 4 cm

f2 = -8 cm

L = 12 cm

di = ?

## Homework Equations

1/f = 1/do + 1/di

## The Attempt at a Solution

a) di1 = 1/(1/f1 - 1/do) = 1/(1/5cm - 1/4cm) = -20 cm (virtual image through a converging lens?)

di2 = 1/(1/f2 - 1/(l - do)) = 1/(1/-8cm - 1/(12-(-2))) = -6.4 cm

This answer is not right. I would really appreciate any help with double lens systems. We're covering them now in class, and I'm very confused by optics!

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