Physics Question About Lenses (see details for actual question)?

Question

A candle is placed 36 cm from a screen. Where between the candle and the screen should a converging lens with a focal length of 8.0 cm be placed to produce a sharp image on the screen?

(the answers are 24 cm and 12 cm, but i need help on how to figure out those answers)

You have to draw a diagram to help solve the question, as well as use The Thin Lens Equations.

This is a grade 11 question by the way.

Answer 1

Here is a tutorial:
http://www.physicsclassroom.com/Class/refrn/U14L5a.html

If this or another answer here proves helpful in your research, you can encourage good answers by choosing one answer as the "best answer."

Cheers,
Bruce