http://i47.tinypic.com/20hahq9.jpg
Which of the glass lenses above, when placed in air, will cause rays of light (parallel to the central axis) to diverge?
1. Z,B, and C
2. Z, P, B, and S
3. B and C
4. Z, C, and S
5. P and C
6. Z, B, and H
7. Z, H, and S
8. Z, P and H
9. P and H
10. Z, P, C, and S

Welcome to the forum. Please note that you should post your attempt or state your difficulty in order that we can guide you to solve the problem. As you are a new comer, I will help you this time.

For the light ray to diverge, one thing you should consider is the thickness of lens is thinner at the centre when compared to the edges.

PhysicsLAB: Diverging Lenses

It is a website that helps you

__________________
Going to face the Hong Kong Advanced-Level Examination which is believed to be the most difficult AL exams in the world this year. I hope good results can be achieved.