# Two lenses in contact

1. Jan 31, 2014

### haha1234

1. The problem statement, all variables and given/known data
(a)Can a converging lens be made to diverging if it is placed into a liquid?
(b)What if?What about a converging mirror?

2. Relevant equations

2. Relevant equations

3. The attempt at a solution3. The attempt at a solution
(a)Let the focal length of the converging lens be f1,and the focal length of the lens be -f2.From the formula ,when the magnitude of f2 is larger than f1,the new focal length we get is smaller than 0,so converging lens can be made to be diverging.
Is it correct?
In (b),can we use the formula again?

THANKS!

2. Jan 31, 2014

If you put an object closer than the focal length,it's light rays will be diverges,so you will see a virtual image.

3. Jan 31, 2014

Try out my program,
https://dl.dropboxusercontent.com/u/260388836/index.html [Broken]

Last edited by a moderator: May 6, 2017
4. Jan 31, 2014