- #1

aChordate

- 76

- 0

## Homework Statement

Two identical converging lenses have focal lengths of 15 cm and are aligned on the

same principal axis. They are separated by a distance of 120 cm. An object sits a distance

of 21 cm to the left of the left lens. What is the total magnification of the two lenses?

## Homework Equations

Thin lens equation

1/f=1/do+1/di

magnification equation

m=di/do

## The Attempt at a Solution

Lens 1:

1/.15m=1/.21+1/di

d-i=0.525m

m=0.525m/0.21m=2.5

Lens 2:

1/.15=1/(.21+1.20m)+1/di

d-i=0.168m

m=0.80

**m-total=0.80+2.5**?