- #1

clintyip

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## Homework Statement

A convex lens and a concave lens both of 6cm focal length are placed to give an object which is 5cm from the convex lens of magnification of 10. How far are the lenses apart?

## Homework Equations

1/f = 1/u + 1/v

Magnification=v/u

## The Attempt at a Solution

Lens One: Convex

f=6cm

u=5cm

v=?

1/f = 1/u + 1/v

1/6 = 1/5 + 1/v

V=-30

Lens Two: Concave

f=-6 (concave)

To get a magnification of 10:

10 = v/u

That's all I have. I have no idea how to work out the distance between the two lenses. Can anyone help please?