What Image Forms with an Object Two Focal Lengths from a Diverging Lens?

[sapiental]

Homework Statement

2. An object is placed two focal lengths from a
diverging lens.
What type of image forms?
What is the magnification?
Where is the image?

Homework Equations

1/f = (n-1)(1/r1-1/r2)

The Attempt at a Solution

a) Virtual Image

b) m = 1

c) the image is on the same side as the object with d_i = -2f

 

[Doc Al]

Homework Equations

1/f = (n-1)(1/r1-1/r2)

That's the "Lens Maker's formula"; what you need is the "Thin Lens formula". (Look it up!)